高考英语单项选择分类训练：连词

这是一份高考英语单项选择分类训练：连词，共19页。
单项选择：连词
1．________ I am willing to help you, I do not have much time available.
A．Since B．For that C．While D．When
2．A digital ring is locked on every newborn baby’s foot ________ they are taken by strangers out of the hospital.
A．Now that B．even if C．so that D．in case
3．_______ we’ll go hiking tomorrow depends on the weather.
A．If B．Whether C．That D．Why
4．In my opinion, the topic is too difficult to understand. Try to simplify your speech ______ it goes beyond the children.
A．even if B．as if C．in fact D．in case
5．We cannot accept a society _____ the rich enjoy comfort _____ the poor have to suffer.
A．which; while B．where; while C．that; which D．where; that
6．Which one of the following sentences is grammatically incorrect?
A．The girl imagined her future college life to be challenging yet enlightening.
B．He is surprised to find that the man should be alive after being buried for hours.
C．With many problems to deal with, he went back to the office and started working.
D．There was no soup served for lunch or there was no vegetable served for dinner.
7．Demand for solar panels has shot up to unprecedented levels in Spain ___________ Europe’s energy crisis shows no sign of letting up, in a welcome boost for a sector with huge potential.
A．but B．though C．as D．while
8．Why do so many students stick to private  tutoring, ________ they could easily master such knowledge at school?
A．unless B．before C．when D．until
9．Mary’s eyes became weak with old age __________ she did simply not see the red light.
A．as long as B．even though C．in case D．so that
10．Human beings are different from animals ______ they can use language as a tool to communicate.
A．in which B．in that C．now that D．with which
11．_________they can’t wipe away the strain of the past, they can certainly move forward.
A．After B．If C．Where D．While
12．The manager promised to deal with the complaint ________ he reached the office.
A．at the time B．every time C．the moment D．at the moment
13．—Your son looks too quiet. Not did I feel he has a good command of communicating.
— Yes, doctor. And he is also stubborn. ________ he has made up his mind to do something, no one can change it.
A．Unless B．Once C．As D．While
14．________many times, but he still didn’t know how to do it.
A．He had been told B．Having been told
C．Having told D．Told
15．Please study hard,________ you’ll fail behind others.
A．and B．so C．or D．but
16．_____ it is true that a student’s most important goal is to do well in her or his studies, it doesn’t need to be the only goal.
A．As B．While C．When D．Since
17．He had ________ the time ________ the intention to think of other things. He was focusing all his attention on the research at that time.
A．both; and B．not only; but also
C．neither; nor D．either; or
18．______ a man sets a goal, he should stick to it ________ he eventually accomplishes it.
A．Once, until B．When, then C．Though, till D．Before, when
19．_____ kids are spending an hour and a half at a sports practice, most aren’t getting all the activity they need for the day.
A．As long as B．When C．Because D．Even if
20．House prices in big cities tend to be higher, _________ those in the countryside are relatively low.
A．when B．while C．however D．since
21．The islanders hadn’t got well prepared ________ they were required to relocate to a nearby island. In fact, it is only two or three years ________ some islanders moved here.
A．since; after B．before; since C．until; that D．after; before
22．There are few of us ______ admire Tanya’s brilliance, eloquence, and leadership.
A．but B．which C．as D．than
23．Rising atmospheric carbon dioxide and higher temperatures actually drove the evolution of far greater numbers of new rainforest plant species ______ wiped out.
A．which were B．as were C．than it was D．than were
24．I set the alarm clock before going to bed I should miss the first train to Beijing.
A．so that B．in case C．as if D．even if
25．The group of wild Asian elephants kept walking to the north all the way ______ they were taking a trip.
A．even if B．as if C．now that D．so that
26．We were just about to leave ________Jerry arrived, who seemed to have something urgent to tell us
A．while B．when C．before D．after
27．—Why do people like classic music? I don’t like it at all.
—________it is not your style, that doesn’t mean it is bad.
A．Even though B．Only if C．Now that D．In case
28．They wanted to charge $5,000 for the car, ________ we managed to bring the price down.
A．if B．for C．or D．but
29．Let us sacrifice our today ______ our children can have a better tomorrow.
A．so that B．in case C．even if D．now that
30．We will do everything we can to help anybody, his background is, to go as far as his talents will take him.
A．wherever B．however C．whichever D．whatever
31．________you call me to say you’re not coming, I’ll see you at the theatre.
A．Though B．Whether C．Until D．Unless
32．Our mother sat us down to read and paint, ________ all we really wanted to do was to make a mess.
A．when B．however C．since D．and
33．I became interested in Beijing opera ________ a small accident.
A．because B．thanks for C．as a result D．thanks to
34．Read the book Cute Pets, ________ you will know how to take care of your cat.
A．or B．so C．and D．but
35．Sweet snacks can give us energy, they are not healthy.
A．and B．or C．but D．then
36．A variety of activities should be organized so that participants can remain active ______ they want.
A．so that B．for fear that C．as long as D．as far as
37．It was not ______ the mid-1980s, when emphasizing gender differences became a dominant children’s marketing strategy, that pink fully came into its own, when it began to seem attractive to girls.
A．because B．while C．unless D．until
38．It is five years ______ she began to take the online courses, and she’s got a lot of experience in how to enrol in various lessons.
A．after B．before C．since D．when
39．Someone called me up in the middle of the night, but he hung up ________I could answer the phone.
A．unless B．until C．before D．since
40．________ it may be possible to measure the value of material goods in terms of money, it is extremely difficult to estimate the true value of the services which perform for us.
A．Because B．Though C．As D．When
41．________difficult, deliveries of food, such as rice, vegetables and meat, must be guaranteed since “the lifeline cannot break.”
A．Whatever B．Whether C．As D．However
42．________ Gina ________Tara are studying Chinese history and culture now. They find them rich and amazing.
A．Not only; but also B．Either; or C．Neither; nor D．Both; and
43．__________super-intelligent AI could be the biggest leap forward in human history, if it goes wrong or falls into the wrong hands, it could also be dangerous.
A．As B．Since C．While D．Once
44．I wanted to make a difference in the world somehow. That was _________ I began to learn about the Light-house Project.
A．what B．because C．which D．why
45．All the guests were having a good time at the party, dancing and singing ________ the electricity was cut off.
A．as long as B．even though C．when D．as if
46．______presenting a negative nucleic acid test within 24 hours, Shanghai residents are not allowed to leave the city.
A．If B．While C．Though D．Unless
47．If you have difficulty in understanding something, you may research, study and talk to other people ______ you figure it out.
A．because B．though C．until D．since
48．Thus not only is he known as s superhero in the Superman films, ________he is also regarded as a superhero to many in real life.
A．and B．but C．or D．/
49．－Did you explain it to your boss?
－He stormed out of the office ________ I could get in a word.
A．since B．when C．before D．after
50．The French eat with both wrists ________on the table, ________many Americans tend to keep their left hands in their laps.
A．rested; but B．rested; while C．resting; but D．resting; while
51．______ you study harder, you’ll never pass the final exam.
A．If B．Until C．Unless D．Except
52．Suzhou is not _______ beautiful _______ Hangzhou.
A．as; than B．so; as C．even; than D．/; than
53．______ you work hard, you will certainly succeed.
A．Though B．If C．Because D．For
54．They didn’t start the work ______ their teacher came back.
A．until B．while C．as soon as D．if
55．I won’t believe you______ I have seen it with my own eyes.
A．while B．until C．after D．when
56．The meeting didn’t start______ everyone was there.
A．because B．until C．why D．if
57．_______ he’s old, he can still carry this heavy bag.
A．Though B．Since C．For D．So
58．—I think the environment is terrible these years.
—Yes, it will be even worse________ the government takes action ________ it.
A．until; protect B．unless; to protect C．if; protecting D．unless; protecting
59．_________ there is good communication and mutual (相互的) understanding between parents and children, there will be no so-called generation gap between them.
A．As soon as B．Even though C．So long as D．Even if
60．As a language grows, new words are introduced ______ many words fall out of use.
A．unless B．so that C．while D．in case
61．We packed all the books in the boxes________they wouldn't get damaged.
A．as long as B．as if C．in case D．so that
62．You must learn to consult your feelings and your reasons ________ you reach any decision.
A．although B．before C．because D．unless
63．A good storyteller must be able to hold his listeners’ attention ______ he reaches the end of the story.
A．when B．unless C．until D．after
64．___________I explained on the phone, I will go with you to the park next Sunday.
A．That B．Which C．As D．When
65．________ food delivery services bring convenience, they let students form some lazy habits.
A．As B．Because C．While D．Whatever
66．The two girls kept talking in the room ________ their mothers said goodbye to each other.
A．when B．unless C．while D．until
67．If the country is fully employed, its boom industries cannot grow ______ other industries shrink.
A．if B．unless C．lest D．for
68．This adventurous child turned into a man who never stopped exploring, ______ in person or through the words he put on paper.
A．no matter B．whether C．however D．whenever
69．He was about to set off________it rained.
A．the moment B．when C．while D．as
70．My boss is waiting for the report, so I can’t leave here ______ I finish it.
A．since B．until C．though D．if

















参考答案：
1．C
【详解】考查从属连词辨析。句意：尽管我很愿意帮助你，但是我没有太多可用的时间。A. Since因为；B. For that因为；C. While虽然，尽管；D. When当……的时候。分析句子可知，“I am willing to help you”和“I do not have much time available”之间存在转折关系，空处应用while来连接两个句子，表示让步转折。故选C。
2．D
【详解】考查连接词词义辨析。句意：每个新生儿的脚上都锁着一个数字戒指，以防被陌生人带出医院。A. Now that既然；B. even if即使；C. so that因此；D. in case以防。根据句意可知，空后是前文做法的目的，应用“以防”引导目的状语从句。故选D项。
3．B
【详解】考查主语从句。句意： 明天我们是否去远足取决于天气。A. if是否；如果；B. Whether是否；C. That引导宾语从句，仅起引导作用，无词义；D. Why为什么。分析句子可知，空处引导主语从句，表示“是否”，if引导主语从句不能置于句首，故选B。
4．D
【详解】考查连词和固定短语辨析。句意：在我看来，这个话题太难理解了。尽量简化你的演讲，以免超出孩子们的理解范围。A. even if即使；B. as if似乎；C. in fact实际上；D. in case以免。由语意可知，这个话题太难理解了，因此才建议要简化演讲，以免孩子听不懂。D选项符合题意。故选D项。
5．B
【详解】考查定语从句和并列句。句意：我们不能接受一个富人享受舒适而穷人受苦的社会。分析句子可知，该句第一空引导的定语从句，先行词a society在从句中作地点状语成分，应用关系副词where；该句第二空为连词while连接的两个简单句，the rich enjoy comfort和the poor have to suffer是对比，while表示对比关系时，意思是“而，然而”。故选B项。
6．D
【详解】考查连词。题干问下面哪个句子在语法上是不正确的，A. The girl imagined her future college life to be challenging yet enlightening. 女孩想象着她未来的大学生活充满挑战，但也很有启发性.imagine something to be“想象” ，yet表示但是；B. He is surprised to find that the man should be alive after being buried for hours. 他惊讶地发现那个人被埋了几个小时后竟然还活着。形容词后用不定式，find后是宾语从句，介词后用动名词的被动形式；C. With many problems to deal with, he went back to the office and started working. There was no soup served for lunch or there was no vegetable served for dinner.由于有许多问题要处理，他回到办公室开始工作。with+宾语+动词不定式表示将来。D. There was no soup served for lunch or there was no vegetable served for dinner.午餐没有汤，晚餐也没有蔬菜。 D选项应该是并列句用and连接，不用or，故选D。
7．C
【详解】考查从属/并列连词。句意：由于欧洲的能源危机没有减弱的迹象，西班牙对太阳能电池板的需求已飙升至前所未有的水平，这对一个具有巨大潜力的行业来说是一个可喜的推动力。A. but但是；B. though尽管，虽然；C. as因为；D. while而。结合句意可知，空后表示原因，应用as引导原因状语从句，故选C。
8．C
【详解】考查连接词词义辨析。句意：既然在学校就能轻松掌握这些知识，为什么还有那么多学生坚持请家教呢？A. unless除非；B. before在……之前；C. when既然；D. until直到 。根据句意及所给句子可知，前后句意存在转折关系，应用when引导让步状语从句。故选C。
9．D
【详解】考查连接词词义辨析。句意：玛丽的眼睛随着年龄的增长而变得虚弱，以至于她根本看不见红灯。A. as long as只要；B. even though即使；C. in case以防；D. so that以至于。根据“Mary’s eyes became weak with old age”可知，玛丽的眼睛因年老而变得虚弱，所以她根本看不见红灯，so that引导结果状语从句。故选D。
10．B
【详解】考查状语从句。句意：人类不同于动物，因为人类可以把语言作为交流的工具。空后they can use language as a tool to communicate，句子结构、句意完整，设空处应用in that，in that意为“因为”，作从属连词，引导原因状语从句。故选B项。
11．D
【详解】考查连词词义辨析。句意：虽然他们无法抹去过去的焦虑，但他们肯定可以向前迈进。根据句意可知，此处前后文为转折关系，故应用连词“while”引导让步状语从句。A. After在……之后；B. If如果；C. Where哪里；D. While尽管。故选D。
12．C
【详解】考查时间状语从句的连词。句意：经理答应，他一到办公室就处理这个投诉。A. at the time 在那时，在那段时间；B. every time 每次；C. the moment 一……就；D. at the moment 此刻，目前，眼下。分析句子结构和意思可知，空格前后是两个小分句，所以需要连词连接，表达“一……就……”的意思。故选C。
13．B
【详解】考查连词词义辨析。句意：——你儿子看起来太安静了。我并不觉得他善于沟通。——是的，医生。他也很固执。一旦他下定决心要做某事，谁也改变不了。A. Unless除非；B. Once一旦；C. As 在...时候；D. While 然而。分析句意可知，此处使用连词once引导时间状语从句，解释说明“固执”。故选B项。
14．A
【详解】考查陈述句。句意：别人已经告诉他很多次了，但他还是不知道该怎么做。根据句中的连词but可知，逗号前的部分应该是一个句子而不是非谓语形式，B项、C项和D项都是非谓语形式，只有填入A项可构成完整的句子。故选A项。
15．C
【详解】考查连词。句意：请努力学习，否则你会落后于别人。A. and和；B.so所以；C.or否则，或者；D.but但是。分析句子可知，此处应为“祈使句+and/or+陈述句”结构，结合句意可知，使用or表示“否则，要不然”符合句意。故选C项。
16．B
【详解】考查让步状语从句。句意：尽管学生最重要的目标确实是在她或他的学习中取得好成绩，但这并不需要是唯一的目标。A. As尽管；B. While尽管；C. When当……的时候；D. Since自从。根据句中“a student’s most important goal is to do well in her or his studies(学生最重要的目标确实是在她或他的学习中取得好成绩)”及“it doesn’t need to be the only goal.(这并不需要是唯一的目标)”可知，两者之间是让步关系，应用while引导让步状语从句，as引导让步状语从句时，需要使用倒装结构。故选B。
17．C
【详解】考查连词词义辨析。句意：他既没有时间也没有心思去想别的事情。那时他把全部注意力都集中在研究上。A. both; and两者都；B. not only; but also不仅……而且；C. neither; nor既不……也不；D. either; or要么…要么…。根据后文“He was focusing all his attention on the research at that time.”可知，他那时把全部注意力都集中在研究上，所以既没有时间也没有心思去想别的事情。故选C项。
18．A
【详解】考查时间状语从句引导词。句意：一个人一旦设定了目标，就应该坚持下去，直到最终实现它。根据句意可知，该句第一空应为连词Once“一旦”，满足句意要求，该句第二空应为连词until“直到……为之”，满足句意要求。故选A项。
19．D
【详解】考查连接词词义辨析。句意：即使孩子们花一个半小时进行体育锻炼，大多数人也没有得到他们一天所需的全部活动。A. As long as只要；B. When当……时候；C. Because因为；D. Even if即使。根据句意可知，前后句意存在让步关系，应用even if引导让步状语从句。故选D项。
20．B
【详解】考查连词。句意：大城市的房价往往较高，而农村的房价相对较低。A. when当……时；B. while然而；C. however无论怎样；D. since自从。结合选项，空处应为连词。根据句意，前后表示对比关系，故用while。故选B。
21．B
【详解】考查连词。句意：岛民们还没有做好充分准备，就被要求迁移到附近的一个岛上。事实上，一些岛民搬到这里才两三年。since自……以后； after在……之后；before在……之前；until直到……为止。分析句意可知，“The islanders hadn’t got well prepared”发生在“they wersince; aftere required to relocate to a nearby island”之前，用before引导时间状语从句，故第1空用连词before；“it is+一段时间+since引导的时间状语从句”是固定句型，故第2空用连词since引导时间状语从句，意为“自从”。故选B项。
22．A
【详解】考查but用法。句意：我们中很少有人不钦佩谭雅的才华、口才和领导力。分析句子可知，此处but用于主句是否定含义（few）的复合句，引导一个肯定结构的从句。其引导的从句可以是主语从句，定语从句，状语从句等，此时的but相当于who/ that/ which... not。故选A项。
23．D
【详解】考查定语从句。句意：大气中不断上升的二氧化碳和更高的温度实际上推动了热带雨林新植物物种的进化，数量远远超过了被消灭的物种。分析可知，空处引导定语从句，先行词numbers被形容词比较级greater修饰，且从句缺少主语，应用准关系代词than引导从句，此时than为复数概念，谓语动词用复数形式。故选D。
24．B
【详解】考查目的状语从句。句意：我在睡觉前把闹钟定好了，以防错过第一班去北京的火车。A. so that以便、所以，引导目的状语从句；B. in case以防、万一，引导目的状语从句；C. as if好像、似乎，引导方式状语从句； D. even if即使、虽然，引导让步状语从句。分析句子可知，设空处在句中引导一个从句，结合句意可知，此处表示“提前设置闹钟，以防错过第一班火车”，前面是结果，后面是目的，此处“错过火车”偏负面，应用in case引导。故选B项。
25．B
【详解】考查方式状语从句和从句连词。句意：这群野生亚洲象一路向北走，好像在旅行。A. even if虽然，即使；B. as if好像，仿佛；C. now that既然；D. so that以便。分析句子可知，句子为方式状语从句，野生亚洲象好像在旅行，根据句意可知，应用“as if”引导从句，意为“好像，仿佛”。故选B项。
26．B
【详解】考查固定句型。句意：我们正要离开时，杰瑞来了，他似乎有急事要处理。A. while当……的时候；B. when在……时候；C. before在……之前；D. after在……之后。固定句型be about to do sth. when...“正打算做某事突然……”，when是并列连词。故选B。
27．A
【详解】考查连词词义辨析。句意：——为什么人们喜欢古典音乐?我一点也不喜欢它。——即使这不是你的风格，也不意味着它不好。A. Even though即使，尽管；B. Only if只有在……的时候，只要……就；C. Now that既然；D. In case以防，万一。根据句意可知“它不是你的风格”与后文的“这并不意味着它不好”之间是转折关系，even though“即使，尽管”，引导让步状语从句，符合句意。故选A。
28．D
【详解】考查连词。句意：那辆车他们要价5000美元，但我们设法把价格降了下来。A. if如果；B. for因为；C. or否则；D. but但是。分析句子，前后两句构成转折关系，故使用but。故选D。
29．A
【详解】考查连词词义辨析。句意：让我们牺牲我们的今天，让我们的孩子有一个更好的明天。A.so that以便为了；B.in case以防、以免；C.even if即使；D.now that既然。根据后句“our children can have a better tomorrow(让我们的孩子有一个更好的明天)”可知，是为了孩子有一个更好的明天。so that引导目的状语从句。故选A。
30．D
【详解】考查让步状语从句。句意：我们将尽我们所能来帮助任何人，无论他的背景是什么，他的才能都将带他走的很远。A.wherever无论在哪里；B.however无论如何；C.whichever无论哪个；D.whatever无论什么。根据句意可知，此处表示“无论什么”，在从句中作表语，应用whatever引导。故选D。
31．D
【详解】考查连词。句意：除非你打电话告诉我你不来了，我就在剧院见你。A.Though尽管； B.Whether是否；C.Until直到；D.Unless除非。分析句子，设空处填写的是条件状语从句从句引导词。unless意为“除非”，符合句意。故选D。
32．A
【详解】考查连词和副词辨析。句意：我们的父母让我们坐下来读书、画画，而我们真正想做的是打打闹闹。A. when虽然，然而；B. however然而；C. since既然；D. and并且。分析句子可知，前后文是句子，需填连词，however是副词，排除B项。两句表让步，应用when引导让步状语从句，这里的when，用于引出使句子的其他部分显得让人吃惊或不大可能的事实或评论，意思是“虽然，然而”。故选A项。
33．D
【详解】考查固定短语辨析。句意：我对京剧产生兴趣是由于一个小意外。A. because因为；B. thanks for因……而感谢；C. as a result结果；D. thanks to由于，多亏。根据句意可知，此处为固定短语thanks to“由于，多亏”，满足句意，because也有“因为，由于”的意思，但是because后需接句子，不可接名词或名词短语。故选D项。
34．C
【详解】考查连词词义辨析。句意：读了《可爱的宠物》这本书，你就会知道如何照顾你的猫。A. or或者；B. so因此；C. and和；D. but但是。分析句子结构可知，此处是祈使句的特殊句型，其结构为：祈使句, and/or+陈述句，此处前后表示顺承关系，所以此处需用连词and。故选C。
35．C
【详解】考查连词词义辨析。句意：甜食能给我们能量，但是它们是不健康的。A. and和，并且；B. or或者；C. but但是；D. then然后。结合语意，甜食能给我们能量，但是它们是不健康的，句子前后是转折关系，应用连词but，表示“但是”。故选C项。
36．C
【详解】考查条件状语从句。句意：应组织各种各样的活动，以便参与者只要愿意就可以保持活跃。A. so that 以便；B. for fear that 唯恐，生怕；C. as long as 只要；D. as far as 就...而言。分析句子结构和意思可知，这里考查表示“只要”意思的连词，引导条件状语从句。故选C。
37．D
【详解】考查从属连词。句意：直到20世纪80年代中期，强调性别差异成为主导的儿童营销策略，粉红色才完全进入自己的领域，开始吸引女孩。A. because因为；B. while在……期间，然而；C. unless除非；D. until直到。not…until…“直到……才”是固定句型，本句为强调句，强调部分为not until引导的时间状语从句。故选D项。
38．C
【详解】考查时间状语从句。句意：自从五年前她就开始注册在线课程，在如何注册各种课程方面她积累了很多经验。A. after conj. 在……以后；B. before conj. 在……之前；C. since conj. 自从；D. when conj. 当……时。分析句子结构和意思可知，这里考查since表示“自从”的意思，引导时间状语从句，构成It is + 时间段+since+主语+did sth.的固定句型。故选C。
39．C
【详解】考查从属连词。句意：有人半夜给我打电话，但我还没来得及接电话，他就挂断了。A. unless除非；B. until直到；C. before在……之前；D. since自从。由语意可知，给我打电话那个人没有等到我接电话就挂断了，所以他是在我接电话前挂断的电话，因此此处应用before引导的时间状语从句。故选C项。
40．B
【详解】考查让步状语从句和连词。句意：虽然物质产品的价值可以用金钱来衡量，但是要估计为我们提供的服务的真正价值却是极其困难的。A. Because因为；B. Though虽然；C. As像……一样，虽然；D. When在……时候。根据句意可知，前后句意有转折关系，“it may be possible to measure the value of material goods in terms of money”是让步状语从句，用从属连词though引导该从句，意为“虽然”；另外as虽也能引导让步状语从句，但从句必须使用倒装。故选B项。
41．D
【详解】考查连词词义辨析。句意：无论多么困难，食物的运输，诸如大米、蔬菜和肉类等食物都必须得到保证，因为“生命线不能断裂”。A.Whatever无论什么；B.Whether是否；C.As如同；因为；D.However无论如何。由空后difficult可知，此处需用however引导让步状语从句，其后接形容词。故选D。
42．D
【详解】考查固定短语辨析。句意：Gina和Tara现在都在学习中国历史和文化。她们发现它们丰富而神奇。A. Not only; but also不但……而且……；B. Either; or要么……要么……；C. Neither; nor既不……也不……；D. Both; and两者都。根据后一句“They find them rich and amazing.(她们发现它们丰富而神奇)”可知，此处指两个人都在学习中国历史和文化，故排除B、C项；not only...but also连接并列主语时，谓语动词遵循“就近原则”，与靠近的主语保持一致，both...and连接并列主语时，谓语动词用复数，由本句中are可知，此处应用both...and。故选D项。
43．C
【详解】考查状语从句的连词。句意：尽管超智能人工智能可能是人类历史上最大的飞跃，但如果它出错或落入坏人手中，也可能是危险的。A. As因为，当……时候；B. Since自……以来，因为；C. While尽管，当……时候；D. Once一旦。由语意可知，前半句表达“超智能人工智能可能是人类历史上最大的飞跃”，后半句表达“如果它出错或落入坏人手中，也可能是危险的”，前后是转折关系，所以用while引导让步状语从句。故选C项。
44．D
【详解】考查名词性从句。句意：我想以某种方式改变世界。这就是我开始了解灯塔计划的原因。A. what什么；B. because因为；C. which哪一个；D. why为什么。分析句型可知，空格处的单词位于was之后引导一个表语从句，由于从句中缺少状语，只能选择because或者why。但是that is because+原因，而that is why+结果，根据句意，“I began to learn about the Light-house Project”表示结果，why符合题意。故选D项。
45．C
【详解】考查连词词义辨析。句意：所有的客人在聚会上都玩得很开心，跳舞、唱歌，这时停电了。A. as long as只要；B. even though尽管，即使；C. when当；D. as if好像。分析可知，此处涉及固定句型be doing...when...“正在……这时突然……”。故选C。
46．D
【详解】考查条件状语从句和从属连词。句意：除非24小时内核酸检测呈阴性者，上海居民一律不准出上海市。A. If如果；B. While当，尽管；C. Though虽然，尽管：D. Unless除非，如果不。根据句意可知，如果24小时内核酸检测是阴性，市民可以出城，unless相当于if...not...，引导条件状语从句，如果24小时内核酸检测不是阴性，那就不能出城。故选D项。
47．C
【详解】考查连词词义辨析。句意：如果你在理解某件事上有困难，你可以研究、学习并与其他人交谈，直到你弄明白为止。A. because因为；B. though虽然，尽管；C. until直到……为止；D. since自从。分析句子可知，句子为时间状语从句，空格处单词引导从句，根据句意可知，句中表示“直到你弄明白为止”，故应用“until”引导从句，意为“直到……为止”。故选C项。
48．B
【详解】考查连词词义辨析。句意：因此，他不仅在《超人》电影中被称为超级英雄，在现实生活中也被许多人视为超级英雄。A. and并且，并列关系；B. but但是，构成not only…but also…句型；C. or或者，选择关系。根据上文“not only is he known as s superhero in the Superman films”可知为句型not only…but also…，also可以省略。故选B。
49．C
【详解】考查连词词义辨析。句意：——你跟你老板解释了吗？——我还没来得及插话，他就怒气冲冲地离开了办公室。A. since自从；B. when当……时候；C. before在……之前；D. after在……之后。根据前后文语境可知，“离开办公室”发生在“插话”之前，应用before。故选C。
50．D
【详解】考查非谓语动词和连词。句意：法国人吃饭时把两只手腕搁在桌子上，而许多美国人则倾向于把左手放在腿上。第一空为with的复合结构，wrist与rest构成主动关系，应用现在分词，作宾语补足语；第二空表示前后文的对比，应用while，but表示转折，不符合语境。故选D。
51．C
【详解】考查条件状语从句。句意：除非你再努力学习一些，否则你将通过不了期末考试。A. If    如果；B. Until直到；C. Unless除非；D. Except除了。根据句意及所给句子可知，此处应用unless引导条件状语从句，其他选项明显不符合题意。故选C。
52．B
【详解】考查连词。句意：苏州不如杭州美。根据句意可知，此处表示“不如……”，表达为not as/so+adj.+as，故选B。
53．B
【详解】考查连词词义辨析。句意：如果你努力工作，你就一定会成功。A. Though尽管；B. If如果；C. Because因为；D. For因为。结合句意可知，此处使用If“如果”引导条件状语从句。故选B项。
54．A
【详解】考查连词。句意：直到老师回来他们才开始工作。A.until直到；B.while当……时候；C.as soon as 一……就；D.if如果。固定短语：not...until...直到……才，结合句意，选项A符合题意。故选A。
55．B
【详解】考查连词词义辨析。句意：直到亲眼看到，我才会相信你。A. while在……期间；B. until到……为止；C. after在……之后；D. when当……时候。分析句意可知，此处为not…until句型，表示“直到……才”。故选B项。
56．B
【详解】考查从属连词。句意：直到所有人都到场，会议才开始。根据句意，not until直到……才……，引导时间状语从句，符合题意，故选B。
57．A
【详解】考查连词。句意：虽然他老了，但是他仍然可以搬动这个重的包裹。A. though conj. 虽然，尽管；B. since conj. 自从；C. for conj. 因为，由于；D. so conj. 因此。根据句子结构和意思可知，这里考查引导让步状语从句的连词，表示“虽然，尽管”的意思。故选A。
58．B
【详解】考查条件状语从句和非谓语动词。句意：——我认为这些年的环境很糟糕。——是的，除非政府采取行动保护它，否则情况会更糟。分析句子可知，句子为条件状语从句，空格一处单词引导从句，根据句意可知，应用“unless”引导从句，意为“除非，如果不”；从句中有谓语动词“takes”，故空格二处应用非谓语动词，保护环境是采取行动的目的，故应用动词不定式“to protect”作目的状语。故选B项。
59．C
【详解】考查连词词义辨析和条件状语从句。句意：只要父母和孩子之间有良好的沟通和相互理解，他们之间就不会有所谓的代沟。A. As soon as一……就……；B. Even though即使；C. So long as只要；D. Even if即使。结合语境可知，用So long as引导条件状语从句。故选C项。
60．C
【详解】考查连词。句意：随着语言的发展，新词不断出现，而许多词却不再使用。A. unless除非；B. so that以至于；C. while然而；D. in case以防万一。根据句意，此处表达对比，while作连词，符合题意。故选C项。
61．D
【详解】考查连词辨析。句意：我们把所有的书都打包放进箱子里，以便它们不被损坏。A. as long as只要；B. as if好像；C. in case以防，万一；D. so that以便。根据句意可知，设空处后的句意是前面句子的目的，因此“so that”符合句意。故选D。
【点睛】
62．B
【详解】考查状语从句连词辨析。句意：在做任何决定之前 ，你应该学会兼顾一下你的情感和理智。A. although尽管；B. before在......之前；C. because因为；D. unless除非。根据语境以及分析句子，空格处填引导状语从句的连词，此处应该是表示动作发生的时间先后顺序。故选B项。
63．C
【详解】考查连词词义辨析。句意：一个好的故事讲述者必须能够吸引听众的注意力，直到故事结束。A. when当；B. unless除非，如果不；C. until直至；D. after在……以后。此处考查时间状语从句的连接词。由语意可知，讲故事者从头至尾地吸引住听众的注意力，hold his listeners’ attention为延续性动作，可与连接词until连用。故选C项。
64．C
【详解】考查定语从句。句意：正如我在电话里解释的，下个星期天我将和你一起去公园。根据句子结构可知，逗号后为主句，前半句中缺少宾语，可用as引导非限制性定语从句，意为“正如”，as指代整个主句。故选C项。
65．C
【详解】考查连词词义辨析。句意：外卖服务在带来便利的同时，也让学生养成了一些懒惰的习惯。A. As由于，因为；当；B. Because因为；C. While尽管；D. Whatever无论什么。根据句意可知，尽管外卖带来了便利，但却让学生养成了懒惰的习惯。所以此处填入While引导让步状语从句，表示“尽管”。故选C项。
66．D
【详解】考查连接词词义辨析。句意：两个女孩在房间里不停地说话，直到她们的母亲互相告别。A.when当......的时候；B.unless除非；C.while当……的时候；D.until直到。由“kept talking in the room”和“their mothers said goodbye to each other”可知，句子表示“两个女孩在房间里不停地说话，直到她们的母亲互相告别”，因此空格处是“直到”，故选D。
67．B
【详解】考查连词词义辨析。句意：如果国家充分就业，除非其他产业萎缩，否则繁荣的产业就无法增长。A. if如果；B. unless除非；C. lest唯恐；D. for因为。根据“its boom industries cannot grow”可知，除非其他产业萎缩，否则繁荣的产业就无法增长。unless 引导的条件句的否定结构。故选B。
68．B
【详解】考查搭配和连词词义辨析。句意：这个爱冒险的孩子变成了一个从不停止探索的人，无论是亲自还是通过他写在纸上的文字。A.no matter不管怎样； B.whether是否； C.however然而； D.whenever无论何时。分析句意，whether...or...为固定搭配，意为“不管……还是……”，引导让步状语从句，符合句意。故选B项。
69．B
【详解】考查固定句型和连词。句意：他刚要出发，天就下雨了。be about to do...when...是固定句型，意为“正要做……这时……”，空格处用并列连词when，故选B。
70．B
【详解】考查时间状语从句。句意：我的老板在等我的报告，所以我得把它写完才能走。A. since自从；B. until直到；C. though尽管；D. if如果。分析句子可知，句子为时间状语从句，根据句意可知，应用“not…until…”，意为“直到……才……，在……以前不……”，故空格处应用“until”。故选B项。