初二英语下册：主谓一致专项强化练习及答案

这是一份初二英语下册：主谓一致专项强化练习及答案，共17页。
初二英语下册：主谓一致
第一部分:1-50 专项练习 第二部分:51-100全面解析

1．The population of China about 1.3 billion.
A．is B．are C．has D．be
2．The customers well in most restaurants.
A．treat B．treats C．is treated D．are treated
3．This listening material, together with its CD-ROMs, well.
A．sells B．sell C．is sold D．are sold
4．Mr. Wang along with his wife and children in the countryside.
A．enjoys living B．enjoy living C．enjoys to live D．enjoy to live
5．We ______ going to sing and dance in the children's hospital next Sunday.
A．is B．was C．are D．were
6．It is said that ______________ of homework ______________been done.
A．two thirds; have B．two third; has
C．two thirds: has D．two third; have
7．The population of the workers ________ 200.
A．are B．is C．were D．has been
8．His father is ill. He ________ look after him.
A．has to B．must C．have to D．has been
9．We don't know if our friend ______tomorrow. If he ______, we will buy something for him
A．will come; will come B．comes; comes
C．will come; comes D．comes; will come
10．— Not only Xiao Hong but also Da Wei _____ well in math.
—Yes, they usually get good grades in math.
A．do B．doing C．does D．did
11．Not only you but also Susan _________ this song. It's very popular.
A．like B．liked C．likes
12．The meat on the plate_________ so delicious. Let's try it together.
A．smells B．sounds C．feels
13．—Rob, shall we go to the cinema tonight?
— I'd love to, but Tim ________________ me out for dinner together.
A．invites B．will invite C．was inviting D．has invited
14．Lots of people across the world __________ about the air safety since Sunday's 737 MAX (机型) crashed (坠毁)on March 10, 2019.
A．are worried B．were worried
C．will be worried D．have been worried
15．—I am not sure if Jane ________ to my birthday party next week.
—She will if she ________ her homework.
A．comes, finishes B．is coming, finishes
C．will come, finish D．will come, will finish
16． the students in our school over two thousand.
A．The number of; is B．The number of; are
C．A number of; is D．A number of; are
17．Both his parent look sad, maybe they ________ what's happened to him.
A．knew B．have known C．must know D．will know
18．This favorite restaurant _____ delicious food ____ the local people
A．provides; at B．provide; to C．provides; for D．provide; with
19．Tony as well as his friends Yunan for a holiday. They will be hack in a week.
A．has been to B．have gone to C．has gone to
20．"He's come back." In the sentence "He's" means .
A．He is B．He has C．He was D．He does
21．—What do you think of the environment here?
—Wonderful！________of the land________ covered with trees and grass.
A．Two fifths; is B．Two fifth; is
C．Two fifths; are D．Two fifth; are
22．We will have a sports meeting the minute it raining.
A．is stopping B．will stop C．stops D．stopped
23．A couple of years ________ since the earthquake took place in Wenchuan.
A．passed B．has past C．have passed D．has passed
24．It ______ five years since we last time each other.
A．is, have seen B．is, saw
C．has been, have seen D．was, saw
25．If your head still ________ tomorrow, then go to a doctor.
A．hurts B．hurt C．hurting D．will hurt
26．Two-thirds of the population in China ________ a good habit of reading.
A．has B．have C．had D．there is
27．Kate ________ the boys ________ going to play basketball.
A．and; is B．as well as; are
C．as well as; is D．with; are
28．Sally as well as her brother ________ reading books.
A．likes B．like C．is liked D．is liking
29．Neither Jim nor Tom _________Australia before, but they know the country very well.
A．has gone to B．has been to C．have gone to D．have been to
30．— Some of the students in our class will go for a picnic, and the rest of them going to watch films.
— ?
A．are; How are you B．is; How are you C．are; What about you
31．— does the elephant weigh?
—Its weight about 6 tons.
A．How many; is B．How much; are C．How much; is
32．In our city there a number of cars and the number of them growing larger and larger.
A．are; is B．have; is C．is; are
33．Look! The police the food onto the bank of the river.
A．am carrying B．is carrying C．are carrying
34．—Why is first so important?
—Because once someone an idea of you, it's hard for him to change that idea.
A．view; getting B．impression; gets C．thought; gets
35．Can you tell me ?
A．where he lives B．where he does live
C．where does he live D．where does he live in
36．The boy his friends was playing in the street when the earthquake happened.
A．with B．and C．as well as D．as far as
37．— Mum, look! My trousers short. Can you buy me a new ?
—OK.
A．is; one B．are; one C．are; pair D．is; pair
38．This pair of sunglasses mine, and your glasses over there.
A．are; are B．are; is C．is; are D．is; is
39．—Why doesn't he come to the party?
—Because he ____ Guangzhou.
A．will go to B．has gone to C．have gone to D．has been to
40．However, no one __________ any life in space yet.
A．has been discovered B．has discovered
C．have discovered D．discovered
41．About fifty percent of the hall ________ a training centre.
A．is used for B．is used as C．are used as D．are used for
42．—Which singer do you like best?
—Wang Fei. I think her ________ is very special.
A．word B．scene C．voice D．sound
43．The book _______ well.
A．sell B．is sold C．sells D．was sold
44．In the last few years, thousands of films _______ all over the world.
A．are producing B．are being produced
C．have been produced D．have produced
45．How many Chinese astronauts _______ into space since 2003?
A．were sent B．sent C．have been sent D．have sent
46．When the song _______, I always think of my hometown.
A．is played B．plays C．will be played D．will play
47．This song _______ by the girls after class.
A．often sings B．often sang C．is often sang D．is often sung
48．Bamboo _______ often _______ to make Paper.
A．was; use B．were; use C．is: used D．are: used
49．The key _______ on the table when I left.
A．was left B．will be left C．is leaving D．leave
50．It _______ heavily when I went outside.
A．rains B．was raining C．were raining D．is raining

答案解析部分

1．A
2．D
3．A
4．A
5．C
6．C
7．B
8．A
9．C
10．C
11．C
12．A
13．D
14．D
15．B
16．A
17．B
18．C
19．C
20．B
21．A
22．C
23．D
24．B
25．A
26．B
27．C
28．A
29．B
30．C
31．C
32．A
33．C
34．B
35．A
36．A
37．C
38．C
39．B
40．B
41．B
42．C
43．C
44．C
45．C
46．A
47．D
48．C
49．A
50．B


初二英语下册：主谓一致
第一部分:1-50 专项练习 第二部分:51-100全面解析

1．The population of China about 1.3 billion.
A．is B．are C．has D．be
全面分析：中国的人口大约13亿。population人口数量作主语，谓语动词用第三人称单数，句子是系表结构，系动词用is，故选A。

2．The customers well in most restaurants.
A．treat B．treats C．is treated D．are treated
全面分析：在大多数饭店顾客被很好招待。句子的主语和谓语之间是被动关系用被动语态，一般现在时的被动语态is/am/are+done，主语是复数，谓语动词用复数，故选D。

3．This listening material, together with its CD-ROMs, well.
A．sells B．sell C．is sold D．are sold
全面分析： 这个听力材料，连同它的光盘，卖得很好。 sell卖； 当sell作“卖得怎么样”时，没有被动语态，用主动表示被动，且此处是together with引导的并列主语，谓语动词根据就远原则，所以此处跟名词单数 This listening material保持一致，所以此处谓语动词用三单形式，故选A。

4．Mr. Wang along with his wife and children in the countryside.
A．enjoys living B．enjoy living C．enjoys to live D．enjoy to live
全面分析：王先生和他的妻子和孩子们喜欢住在农村。along with，与......一起，介词短语，遵循就远原则，连接两个主语时，谓语动词要与前面的主语在人称和数上一致。Mr. Wang ，第三人称单数，谓语动词要用第三人称单数。故排除B/D；enjoy doing sth喜欢做某事，固定搭配，排除C，故选A。

5．We ______ going to sing and dance in the children's hospital next Sunday.
A．is B．was C．are D．were
全面分析：下周日我们打算在儿童医院唱歌跳舞。根据时间状语next Sunday可知句子是一般将来时，一般将来时的结构is/am/are+going to do，根据主语we，可知系动词用are，故选C。

6．It is said that ______________ of homework ______________been done.
A．two thirds; have B．two third; has
C．two thirds: has D．two third; have
全面分析：据说三分之二的家庭作业已经完成了。分数的表达方法：分子要用基数词，分母要用序数词，当分子大于1时，分母要用序数词的复数形式；故排除选项B/D；分数作主语时，关键看后面名词是否可数来决定单复数：当名词是复数时，谓语动词要用复数；当名词是可数名词单数/不可数名词时，谓语动词要用单数。of 后的homework，不可数名词，谓语动词要用单数has，故排除A，综上所述，故选C。

7．The population of the workers ________ 200.
A．are B．is C．were D．has been
全面分析：工人的人口数是200。由句意可知这里说的是“工人的总数”，population作了不可数名词，因此其be动词要用is，故选B。

8．His father is ill. He ________ look after him.
A．has to B．must C．have to D．has been
全面分析： 他父亲病了，他得照看他。主语是he，第三人称单数，故谓语动词是单三式，故排除C选项，look是动词原形，故此处是情态动词，故排除D，have to侧重客观上的必须，must侧重于个人意志和主观上的必须。must没有时态的变化，根据His father is ill可知是客观事实，故是has to，故选A。

9．We don't know if our friend ______tomorrow. If he ______, we will buy something for him
A．will come; will come B．comes; comes
C．will come; comes D．comes; will come
全面分析： 我们不知道我们的朋友明天是否会来。如果他来，我们会给他买些东西。第一个空，tomorrow是一般将来时标志，if 引导宾语从句，故用将来时，第二个空if 引导条件状语从句，时态是主将从现，故用一般现在时，故选C。

10．— Not only Xiao Hong but also Da Wei _____ well in math.
—Yes, they usually get good grades in math.
A．do B．doing C．does D．did
全面分析：——不仅肖红，而且大魏在数学方面也做得很好。——是的，他们通常数学成绩很好。not only...but also...，不仅……而且……，并列连词，连接并列部分作主语时谓语动词要与第二个主语（靠近动词的主语）在人称和数上一致。根据答语 they usually get good grades in math，可知用一般现在时，上句也要有一般现在时，根据就近原则， 主语Da Wei，第三人称单数，谓语动词do要用第三人称单数does，故选C。

11．Not only you but also Susan _________ this song. It's very popular.
A．like B．liked C．likes
全面分析：不但你而且苏珊都喜欢这首歌，它非常流行。not only…but also连接主语时，应遵循就近原则，挨着谓语动词的Susan是第三人成单数，因此动词使用单三形式，故答案是C。

12．The meat on the plate_________ so delicious. Let's try it together.
A．smells B．sounds C．feels
全面分析：盘子上的肉味道鲜美。我们来尝一尝吧。A.闻起来；B.听起来；C.感觉，根据delicious，可知是闻起来，故答案是A。

13．—Rob, shall we go to the cinema tonight?
— I'd love to, but Tim ________________ me out for dinner together.
A．invites B．will invite C．was inviting D．has invited
全面分析：——罗伯，我们今晚去看电影好吗？我很想去，但蒂姆来邀请我一起出去吃晚饭了。根据答语 I'd love to, but，可知invite的动作对现在产生的影响，将不能去看电影，要用现在完成时have/has+过去分词。主语Tim，第三人称单数，要用has，invite的过去分词invited。故选D。

14．Lots of people across the world __________ about the air safety since Sunday's 737 MAX (机型) crashed (坠毁)on March 10, 2019.
A．are worried B．were worried
C．will be worried D．have been worried
全面分析：自2019年3月10日星期天的737 Max坠毁以来，世界各地的许多人都在为航空安全担心。be worried about...，为……担心，固定短语；根据 since Sunday's 737 MAX (机型) crashed (坠毁) on March 10, 2019. 表示从这天开始到现在，世界上的许多人一直在担心航空安全，要用现在完成时have/has+过去分词，主语lot of people，复数，要用have，be的过去分词been，故选D。

15．—I am not sure if Jane ________ to my birthday party next week.
—She will if she ________ her homework.
A．comes, finishes B．is coming, finishes
C．will come, finish D．will come, will finish
全面分析：—— 我不确定简是否会参加我下周的生日聚会。———如果她做作业完成了，她会去的。第一个空根据next week，可知宾语从句的时态是一般将来时，第二个空是if 引导的条件状语从句，从句用一般现在时，主语是she第三人称单数，故谓语用单三式，故选B。

16． the students in our school over two thousand.
A．The number of; is B．The number of; are
C．A number of; is D．A number of; are
全面分析：这个工厂的工人的数目超过两千人。The number of，……的数目，谓语动词用单数；A number of，许多，谓语动词用复数，根据 over two thousand ，可知超过两千人是总数。故选A。

17．Both his parent look sad, maybe they ________ what's happened to him.
A．knew B．have known C．must know D．will know
全面分析：他父母看起来都很难过，也许他们知道他出了什么事。know，知道，及物动词，接宾语从句。根据从句 what's happened to him，可知用现在完成时，主句要用现在完成时 have/has+过去分词。主语they，复数，要用have；know的过去分词known。故选B。

18．This favorite restaurant _____ delicious food ____ the local people
A．provides; at B．provide; to C．provides; for D．provide; with
全面分析：这家最受人喜爱的餐馆给当地人提供美味可口的食物。描述客观事实用一般现在时，主语是restaurant，第三人称单数，故谓语动词是单三式provides；provide sth for sb，固定搭配，给某人提供某物，故选C。

19．Tony as well as his friends Yunan for a holiday. They will be hack in a week.
A．has been to B．have gone to C．has gone to
全面分析：汤姆和他的朋友们去云南度假了。has been to去过某地；have gone to到某地去了，根据 They will be hack in a week. 可知他们到云南去了，因此用have gone to；as well as连接两个名词做主语时强调前者，因此谓语动词的形态要根据as well as前面的名词确定，Tony第三人称单数，谓语动词用has，故选C。

20．"He's come back." In the sentence "He's" means .
A．He is B．He has C．He was D．He does
全面分析：他回来了。在句子“He's”的意思是He has。根据句子结构这个句子是现在完成时，现在完成时的结构have/has+done，主语是第三人称单数，助动词用has，所以He's=He has，故选B。

21．—What do you think of the environment here?
—Wonderful！________of the land________ covered with trees and grass.
A．Two fifths; is B．Two fifth; is
C．Two fifths; are D．Two fifth; are
全面分析：——你认为这的环境怎么样？——太棒了！五分之二的陆地覆盖着树和草。two fifths，分数表达法，五分之二，主语是land，名词单数，故谓语是is，故选A。

22．We will have a sports meeting the minute it raining.
A．is stopping B．will stop C．stops D．stopped
全面分析：雨一停，我们就开运动会。A. is stopping现在进行时；B. will stop一般将来时；C. stops动词第三人称单数形式；D. stopped过去式；the minute意为“一……就”，相当于when或as soon as引导的时间状语从句。句子时态遵循“主将从现”原则。根据前面主句谓语动词will have，用一般将来时，从句用一般现在时表示将来。主语it，第三人称单数，谓语动词要用第三人称单数stops。故选C。

23．A couple of years ________ since the earthquake took place in Wenchuan.
A．passed B．has past C．have passed D．has passed
全面分析： 自从汶川发生地震，几年已经过去了。Since自从，常和现在完成时连用。A couple of years几年，将一段时间看做一个整体，谓语动词用单数形式，故此题选D。

24．It ______ five years since we last time each other.
A．is, have seen B．is, saw
C．has been, have seen D．was, saw
全面分析：自从我们上次见面已经5年了。根据 last time，可知从句用过去时态，排除A/C；根据句意自从我们上次见面现在，可以用一般现在时态或者现在完成时，不能一般过去时态，故答案选B。

25．If your head still ________ tomorrow, then go to a doctor.
A．hurts B．hurt C．hurting D．will hurt
全面分析：如果明天你的头还痛，那就去看医生。考查if引导的条件状语时态。If引导的条件状语从句，主将从现，主情从现，主祈从现，本句主句是祈使句，可知从句是一般现在时，从句主语your head第三人称单数，可知谓语使用三单形式，故填hurts，故选A。

26．Two-thirds of the population in China ________ a good habit of reading.
A．has B．have C．had D．there is
全面分析：中国三分之二的人口有良好的阅读习惯。考查主谓一致。has有，三单形式；have有，动词原形；had有，过去式；there is某地有某物；当句子主语是分数连接时，且分数词修饰population时，则句中谓语动词一律用复数形式，这里表达的是“有”，所以用have原形，故答案选B。

27．Kate ________ the boys ________ going to play basketball.
A．and; is B．as well as; are
C．as well as; is D．with; are
全面分析：Kate和这些男孩打算去打篮球。and和，而且；连接并列主语时谓语用复数，as well as还有，和；连接主语时谓语看其前面的名词或代词的数，with和……一起；和主语连用时谓语看with前面的名词或代词的数，所以A，B和D选项错误，故答案为C。

28．Sally as well as her brother ________ reading books.
A．likes B．like C．is liked D．is liking
全面分析：莎莉和她哥哥一样喜欢读书。as well as，两个名词作主语，根据as well as遵循就远原则，前面名词的单复数决定谓语动词的单复数，句子时态是一般现在时，主语Sally，第三人称单数，谓语动词用第三人称单数，故选A。

29．Neither Jim nor Tom _________Australia before, but they know the country very well.
A．has gone to B．has been to C．have gone to D．have been to
全面分析：吉姆和汤姆以前都没去过澳大利亚，但他们对这个国家很了解。have been to去过，have gone to到某地去了，结合句意吉姆和汤姆以前都没去过澳大利亚，但是他们对这个国家非常了解。可知此处用have been to。neither…nor…， 连接主语时, 谓语动词根据"就近原则"确定适当形式，根据主语Tom，第三人称单数，可知谓语助动词用第三人称单数形式has，故选B。

30．— Some of the students in our class will go for a picnic, and the rest of them going to watch films.
— ?
A．are; How are you B．is; How are you C．are; What about you
全面分析：——我们班的一些学生将去野餐，其余的学生将去看电影。——你呢？根据语境可知the rest of them，指的是剩余的学生，做主语时谓语动词要用复数形式，应填are；第一句介绍了班里学生的活动情况，很自然地询问对方要干什么，了解情况，应该填写what about you，故选C。

31．— does the elephant weigh?
—Its weight about 6 tons.
A．How many; is B．How much; are C．How much; is
全面分析：——大象有多重？——它的重量约为6吨。根据答语可知第一句询问的是体重，要用how much来提问；weight是不可数名词，作句子主语时，谓语动词应用单数形式。故选C。

32．In our city there a number of cars and the number of them growing larger and larger.
A．are; is B．have; is C．is; are
全面分析：在我们的城市里，有许多汽车，而且它们的数量越来越大。a number of cars，大量的汽车，中心词是cars，作主语时谓语动词要用复数形式，在there be结构中要用are；the number of them，它们的数量，中心词是number，作主语时谓语动词要用单数形式，此句中要用is，故选A。

33．Look! The police the food onto the bank of the river.
A．am carrying B．is carrying C．are carrying
全面分析：看！警察正在把食物带到河岸上。根据Look，可知时态要用现在进行时，the police属于集体名词，谓语动词要用复数are，故选C。

34．—Why is first so important?
—Because once someone an idea of you, it's hard for him to change that idea.
A．view; getting B．impression; gets C．thought; gets
全面分析：——为什么第一印象如此重要？——因为一旦有人对你产生了想法，他就很难改变这个看法。view看法；impression印象，；thought想法。由first，第一次，可知就是印象，impression；根据连系动词is，要用一般现在时，主语someone，某人，不定代词，看做第三人称单数，谓语动词要用第三人称单数。get的第三人称单数gets，故选B。

35．Can you tell me ?
A．where he lives B．where he does live
C．where does he live D．where does he live in
全面分析：你能告诉我他住在哪里吗？tell是及物动词，后接宾语从句。从句的语序陈述句语序：主语+谓语。故排除选项C/D；一般现在时的肯定句主语第三人称单数he，谓语动词要用第三人称单数lives，故排除选项B。故选A。

36．The boy his friends was playing in the street when the earthquake happened.
A．with B．and C．as well as D．as far as
全面分析：地震发生时，那个男孩和他的朋友一起在街上玩。A： with与......一起，介词，连接主语时，谓语动词与第一个主语在人称和数上一致（就远原则）； B： and又，和，连词，连接并列的主语，谓语动词要用复数； C： as well as与......一样，连接并列主语时，与第一个主语在人称和数上一致（就远原则）； D： as far as只要。根据... playing in the street，他与他朋友在街道上一起玩，故选A。

37．— Mum, look! My trousers short. Can you buy me a new ?
—OK.
A．is; one B．are; one C．are; pair D．is; pair
全面分析：——妈妈，看！我的裤子短。你能给我买一双新的吗？——好的。第一个句子的主语my trousers，复数，连系动词be要用are；根据上文 My trousers short. 可知想买一条新裤子。要用a new pair of trousers。a pair of...一条，一双，固定短语。故选C。

38．This pair of sunglasses mine, and your glasses over there.
A．are; are B．are; is C．is; are D．is; is
全面分析：这副太阳镜是我的，你的眼镜在那边。glasses，可数名词，眼镜，常用复数形式，作主语时谓语动词要用复数；当与pair连用作主语时，谓语动词的形式由pair来决定。this pair of sunglasses中的pair是单数，系动词要用is；your glasses是复数形式，谓语动词要用are，故选C。

39．—Why doesn't he come to the party?
—Because he ____ Guangzhou.
A．will go to B．has gone to C．have gone to D．has been to
全面分析：——为什么他没来晚会？——因为他去了广州。根据 Why doesn't he come to the party，可知用have gone to，表示去了某地，主语是he，单数第三人称，故助动词用has，故选B。

40．However, no one __________ any life in space yet.
A．has been discovered B．has discovered
C．have discovered D．discovered
全面分析：可是，还没有人发现太空中有任何生命。yet是现在完成时标志，主语是no one，单数第三人称，discover和主语是主动关系，故用has discoverd，故选B。

41．About fifty percent of the hall ________ a training centre.
A．is used for B．is used as C．are used as D．are used for
全面分析：大约50%的大厅被用作训练中心。be used for被用于……；be used as，被用作……；由于是大厅，应该用作训练中心，主语是hall，be动词用is，故选B。

42．—Which singer do you like best?
—Wang Fei. I think her ________ is very special.
A．word B．scene C．voice D．sound
全面分析：——你最喜欢哪个歌手？——王菲。我觉得她的声音很特别。A话语；B场景；C嗓音；D声音。voice一般指人的嗓音，而sound泛指自然就所有的声音，这里指王菲的歌声，因此用voice，故选C。

43．The book _______ well.
A．sell B．is sold C．sells D．was sold
全面分析：这本书很畅销。书被卖，动词sell 主动表被动， 主语是book，谓语动词用单三式sells，故选C。

44．In the last few years, thousands of films _______ all over the world.
A．are producing B．are being produced
C．have been produced D．have produced
全面分析：在过去的几年里，世界各地已经制作了数千部电影。由 in the last few years，在过去的几年里，可知常与现在完成时连用；films，电影，与动词produce生产之间是被动关系，被生产，要用被动语态。句子的谓语动词要用现在完成时的被动语态have/has+been +过去分词，films，可数名词复数，要用have，produce的过去分词produced，故选C。

45．How many Chinese astronauts _______ into space since 2003?
A．were sent B．sent C．have been sent D．have sent
全面分析：自2003年以来，有多少中国宇航员被送入太空？由since 2003，自从2003年以来，时间状语，可知与现在完成时连用；astronauts与send之间是被动关系，被发送，要用被动语态。句子的谓语动词要用现在完成时的被动语态：have/has+been+过去分词，主语是astronauts，宇航员，复数，要用have，send的过去分词sent，故选C。

46．When the song _______, I always think of my hometown.
A．is played B．plays C．will be played D．will play
全面分析：播放歌曲时。我总是想起我的家乡。根据频率副词always，要用一般现在时；由the song与play之间被动关系，被播放，要用一般现在时的被动语态，be（am/is/are)+过去分词。主语the song，第三人称单数，要用is，play的过去分词played，故选A。

47．This song _______ by the girls after class.
A．often sings B．often sang C．is often sang D．is often sung
全面分析：这首歌常在课后由女生演唱。由this song与sing唱歌之间是被动关系，要用被动语态；often，经常，频率副词，要用一般现在时。要用一般现在时的被动语态be（am/is/are）+过去分词，主语this song，第三人称单数，sing的过去分词sung，故选D。

48．Bamboo _______ often _______ to make Paper.
A．was; use B．were; use C．is: used D．are: used
全面分析：竹子常被用来造纸。根据频率副词，可知要用一般现在时；bamboo竹子与use之间是被动关系，要用一般现在时的被动语态be（am/is/are)+动词过去分词。主语是bamboo，第三人称单数，助动词be，要用is；use的过去分词used，故选C。

49．The key _______ on the table when I left.
A．was left B．will be left C．is leaving D．leave
全面分析：我离开时钥匙落在桌子上了。由时间状语从句when I left，可知主句要用一般过去时；the key与leave之间是被动关系，所以要用一般过去时的被动语态，was/were+过去分词。主语是the key，第三人称单数，助动词be，要用was；leave的过去分词left，故选A。

50．It _______ heavily when I went outside.
A．rains B．was raining C．were raining D．is raining
全面分析：当我出去的时候天正在下着大雨。根据语境，可知用过去进行时was/were doing，主语是it，be动词用was，故选B。