初中考英语：情态动词强化练习100题

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初中英语：情态动词强化练习100题
第一部分:1-50 专项练习 第二部分:51-100名师解题

1．—What's wrong with Judy? She has been absent for two days.
—Oh, she _____ be ill. Let's go to ask Mr. Green.
A．may B．need C．would
2． Please don't make so much noise. I hear the speaker very well.
A．needn't B．mustn't C．can't D．shouldn't
3．—Look at the young lady in red．Is it Mrs．King？
—No，It ________ be her．She is wearing a white dress today．
A．can B．may C．must D．can't
4．I can't go with you. I _______ stay at home until my parents come back.
A．can B．may C．must D．could
5．—Mum, ______ I visit the Science Museum tomorrow?
—I'm afraid you can't. It is closed on Monday.
A．must B．may C．should
6．—Does he need _____ there at once?
—No, he _______ leave so hurriedly because he has enough time.
A．to go; doesn't need B．go; needn't C．to go; needn't
7．Rock music ______ sound popular with the young, but it's not the favor of the aged people.
A．must B．need C．should D．may
8．—Is that boy Tom?
—It ___________ be Tom. He has gone to his hometown to visit his grandparents.
A．can B．can't C．must D．mustn't
9．—Hi .Jack! Could you come to our English party?
—Sorry， I . I have to look after my little sister at home.
A．must B．could C．can't
10．You ______ stop when the traffic light is red.
A．can B．could C．may D．must
11．— I have been to Mars several times.
—You ______ be joking. It's impossible.
A．can B．may C．must
12．In some countries，people download （下载） music from the Internet without paying，because it's against the law．（　　）
A．wouldn't B．needn't C．mustn't D．couldn't
13．﹣ Could I smoke here?
﹣ Sorry. I am afraid you _______. Look at the sign "No smoking"!
A．couldn't B．needn't C．can't D．won't
14．﹣ Mom, ______ I visit the art museum next Monday?
﹣ I'm afraid you can't. All museums in the city are closed on Monday.
A．would B．need C．should D．may
15．— What do you want to have for supper? I will cook earlier today.
— Honey, you ________. Let's go out to have something different.
A．mustn't B．don't have to C．can't
16．— Hi, madam. Can I take the story books out?
— No, my boy. They ______ be taken out of the reading-room. It's a rule.
A．mustn't B．needn't C．couldn't D．wouldn't
17．– Is that man Mr. Green?
– It _____ be him. He has gone to Paris on business.
A．may B．must C．can't D．shouldn't
18．— I can't stop playing computer games.
— For your health and study, my boy, I am afraid you ________.
A．can B．may C．must D．have to
19．— Who is the man over there? Is it Mr. Li?
— No. It ________be him. Mr. Li is much taller.
A．mustn't B．may not C．can't D．needn't
20．— Mum, can I wear my jeans to school?
— No, you ________ wear your school uniforms. That's the school rule.
A．can B．can't C．have to D．may
21．He ________ be in his office, for I left there just now.
A．can't B．may not C．mustn't D．don't have to
22．The hurt man was very weak. So he must ________ to hospital right now.
A．be taken B．be take C．take D．take care of
23．— Must I leave now?
— No, you ________.
A．mustn't B．needn't C．don't D．won't
24．You ________ wear sports shoes when you climb a mountain.
A．can't B．shouldn't C．mustn't D．have to
25．— Could I look at your picture?
— Yes, of course you ________.
A．could B．can C．will D．would
26．— Must I finish my homework now?
— No, you ________.
A．may not B．mustn't C．can't D．needn't
27．You ________ be noisy, children. They are sleeping here now.
A．mustn't B．must C．may D．may not
28．—Do you have any plans for this Sunday?
—I'm not sure. I go to the countryside to see my grandmother.
A．can B．must C．may D．need
29．— May we leave the classroom now?
— No, you ________. You ________ to leave until the bell rings.
A．mustn't; are allowed B．don't have to; are supposed
C．needn't; aren't allowed D．can't; aren't supposed
30．— Jenny, we buy Mom presents. We can clean the house from top to bottom.
— Good idea! It's a special present for Mother's Day.
A．can't B．mustn't C．shouldn't D．needn't
31．— Look! Mr. Lee is standing under the tree.
— It ______ him. He has gone to Canada for his holiday.
A．must be B．mustn't be C．can be D．can't be
32．— Listen! Someone is knocking at the door. Who can it be?
— It _______ be Tom. He said he would visit me this evening.
A．can't B．need C．must D．mustn't
33．— Mom, must I take out the trash now?
— No, you ________. You may take a rest first.
A．mustn't B．can't C．shouldn't D．don't have to
34．— Must I leave the room now?
— No, you _______.
A．needn't B．can't C．mustn't D．couldn't
35．— I take the PE test, Mr Zhang?
— Yes, you must.
A．Can B．Will C．Should D．Must
36．- Sorry, Miss Liu. I left my workbook at home. Must I hand it in today?
- No, you ______. You ______ bring it here tomorrow.
A．mustn't; should B．can't; must
C．mustn't; may D．needn't; can
37．- What will the weather be like tomorrow?
- It _____ be rainy, cloudy or sunny. Who knows?
A．must B．might C．should D．can't
38．All the students _____ know cheating in the exam is not allowed.
A．need B．may C．must D．can
39．- Let's go climbing, shall we?
- You______ be joking! Don't you know I'm afraid of high places?
A．must B．can C．may D．should
40．- Do you think that Kobe will be elected as the MVP this year?
- It _________ him. He has retired（退役） since April 13.
A．can't be B．mustn't be C．must be D．can be
41．- I still haven't found my pet dog.
-I'm sorry to hear that. You______ be very sad.
A．can B．should C．must D．will
42．The news he told us be true because he is an honest boy.
A．can B．would C．can’t D．must
43．He be lost because he has been here several times.
A．must B．might C．can’t D．could
44．The baby is always crying. He be hungry.
A．can't B．must C．should D．would
45．-- Must I complete the writing today, sir?
-- No, you _______. You may _______ tomorrow morning.
A．mustn't; hand it in B．don't have to; hand it in
C．needn't; hand in it D．can't; hand in it
46．-- I have a serious headache. I go to school?
-- No, you needn't.
A．Must B．Can C．Should D．May
47．The lady in red ______ be over fifty! She looks so young.
A．can’t B．mustn’t C．can
48．— _____ you play golf?
— No. But I can play table tennis.
A．Can B．May C．Must
49．He speak English very well although he has studied it for only one year.
A．mustn't B．can't C．must D．can
50．The girl in the classroom be Sarah. She has gone to the library.
A．may B．must C．can't D．needn't


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


初中英语：情态动词强化练习100题
第一部分:1-50 专项练习 第二部分:51-100名师解题

1．Dogs_____run through soccer games at the park. It's dangerous.
A．should B．shouldn't C．need D．needn't
全面解析：狗不应该跑着穿过公园里的足球比赛，太危险了。A. should 应该； B. shouldn't 不应该； C. need 需要； D. needn't 不需要。根据 It's dangerous.太危险了可知应是不应该。故选B。
【点拨】本题考查情态动词的用法及辨析，注意识记不同情态动词的意思及用法。
2．—I wonder if these are Danny' s glasses.
—They ______ be Danny's. He doesn't wear glasses.
A．can't B．must C．mustn't D．can

全面解析：—我想知道这是否是丹尼的眼镜。—不可能是丹尼的。他不戴眼镜。can't不可能；must一定；必须；mustn't（表示禁止）肯定不是；can可能。根据后一句可知是否定的猜测，故答案为A。

3．We should keep quiet in the cinema．We speak loudly．（　　）
A．can B．must C．needn't D．mustn't

全面解析：can能，会；must一定，必须；needn't不需要；mustn't不可以．根据We should keep quiet in the cinema．We speak loudly，可知我们应该在电影院里保持安静．我们不能大声说话．这里表示明令禁止的事情，这里用mustn't．故选D．
4．—Is that boy Tony？

—It _____ be him．He has gone to Shanghai．（　　）
A．may not B．should C．can't

全面解析：——那个男孩是托尼吗？——不可能是他，他已经去了上海．A.may not不可以，可能不；B.should应该；C.can't不可能，表示推测．根据句子He has gone to Shanghai．他已经去了上海．可知不可能是他，故答案为C。


5．I have travelled a lot. I ________ speak four languages.
A．can B．may C．must D．need

全面解析：我经常旅游，我会说四种语言。根据语境可知，本句表达的是能力。A. can能，表示能力；B. may 可以，表示选择的可能性；C. must必须，表示规定或要求；D. need，需要，表示必要性；根据意义及用法，故选A。

6．This pair of glasses ______ be Tony 's. He's the only one who wears glasses.
A．must B．might C．can't

全面解析：考查情态动词表推测。根据题干第二句句意“他是唯一戴眼镜的人”可知“这副眼镜肯定是托尼的”。must肯定，一定（表肯定推测）；might可能，也许；can't肯定不，一定不（表否定推测）。故选A。
7．— Robert, could you wash the car for me?
— Yes, I _______. I'm coming, dad.
A．could B．couldn't C．can D．can't

全面解析：考查情态动词用法。根据答语yes，排除B和D，再由问句could you…?是表请求的委婉句，回答时不能用could或couldn't，而应该用can或can't来回答，故选C，本题易错选A。类似的问句还有would you …?回答时也只能用will或won't，不能用would功wouldn't。
8．—Mum，I've signed for the box．What's in it？
—I'm not sure．It _____ be a present from your uncle．
A．need B．must C．may D．will

全面解析：—妈妈，我为这个盒子签了字，里面有什么？—我也不确定。这可能是你叔叔送的礼物。need需要；must必须；may可能；will将会．根据I'm not sure，所以下面说可能是你叔叔送的礼物，这里应该用may表示一种可能性，但是这个可能性不是很大。故选C。
9．— I hand in the report today?
— No, you needn't.
A．Can B．Must C．Shall D．Could

全面解析：—我今天必须交报告吗？—不，你不必。考查情态动词。A. Can能；B. Must必须； C. Shall将，一般用于第一人称；D. Could能，可以。Must开头的一般疑问句（Must I/she/he….？），它的肯定回答是Yes，主语+must. 否定回答是No, 主语+needn't. 根据答语 No, you needn't. 可知疑问句用must提问，故选B。

10．—Excuse me, where is the nearest bank?
—Go straight ahead, you ______ miss it.
A．mustn't B．can't C．needn't D．shouldn't

全面解析：——打扰一下，最近的银行在哪里？——往前直走，你不会错过它的。A一定不行，B不会/不可能，C不需要，D不应该。根据 Go straight ahead. 往前直走，可知银行就在前面，不会错过的，因此用can't，语气坚定，故选B。
11．—Listen! Someone is talking in the meeting room.
—It ________________ be Thomas. He has gone to Europe.
A．can't B．needn't C．must

全面解析：—听！有人正在会议室说话。—它不可能是托马斯。他已经去了欧洲。can't不可能，表示有把握的推测；needn't没有必要，表示要求；must一定，表示有把握的推测。根据He has gone to Europe.可知他去了欧洲，还没有回来，因此不可能是他，故选A。

12．—_______________ I see your ID card? We have to check your personal information.
—Sure. Here you are.
A．Must B．Should C．May

全面解析：—我可以看看你的学生证吗？我们必须检查你的个人信息。—当然可以。给你。Must表示必须；should表示应该；may表示可以。根据We have to check your personal information.可知此处表示需要检查对方的学生证，因此征询对方意见，是否可以看看学生证，故用May I……?故选C。

13．— Excuse me, whose French book is this?
—It be Tom's. In our class, only he is studying French.
A．must B．can't C．May

全面解析：打扰一下，这是谁的法语书？一定是汤姆的，在我们班，只有他学习法语。根据句意，只有汤姆一个人学习法语，那么推测这本书是汤姆的可能性很大，所以用must。故选A。

14．— ________ I watch Ode to Joy (《欢乐颂》) on TV now, Mom?
— No, you can't. You ________ finish your homework first.
A．May；must B．Can；need C．May；can D．Must；needn't

全面解析：—妈妈，我现在可以在电视上看《欢乐颂》吗？—不，你不能，你必须先做完你的家庭作业。may 可以，表示征求许可；must必须；can能，可以；need需要；needn't不需要，不必。第一个空表示征求许可，可以用may或者can；第二个空表示语气比较强，必须先完成作业，应用must。故选A。

15．—Have you decided where to go for your summer vacation?
—Not yet. We ____go to Dalian. It's a good place for vacation.
A．need B．may C．must D．may not

全面解析：你们决定去哪里过暑假了吗？—还没有。我们可能去大连。那是一个度假的好地方。need需要，表示要求；may可能，表示没有把握的猜测；must必须，表示要求；根据Not yet可知还没有决定去哪里度暑假，不要去大连度假，这只是一种猜测，故选B。

16．—It's nearly 6:00 p.m. Will you have supper here?
—Sorry, I ____. I have many things to do.
A．mustn't B．can't C．needn't D．won't

全面解析：将近傍晚六点钟了，你在这里吃晚饭好吗？—对不起，我不能，我有很多事情要做。A. mustn't禁止，B. can't 不能；C. needn't 不必；D. won't不会。will在这里表示一种委婉的语气，不表将来时态，对于别人发出的邀请，如果不同意，常说Sorry, I can't. 然后加上理由，故选B。

17．— What does Justin Bieber's song Never Say Never impress you most?
— It tells us that we _______ do almost anything if we never give up.
A．can B．have to C．should D．need

全面解析：—为什么贾斯汀·比伯的《永不言败》让你感触最深？—因为它告诉我们只要我们从不放弃，我们就……做到任何事情。A. can 可以，能；B. have to，不得不；C. should 应该；D. need 需要。根据句意，可知应该是如果我们从不放弃就可以做到任何事情，此处缺少的是能、会。故选A。

18．—Must I leave now?
—No, you_________. You may still stay here if you like.
A．mustn't B．can't C．don't have to D．won't

全面解析：—我现在必须离开吗？—不必了，如果你喜欢你仍然可以呆在这里。在回答must开头的一般疑问句时，肯定回答用must，否定回答用needn't或don't have to. 根据No,可知这里是否定回答。故选C。

19．—May I go birdwatching with my classmates in the Nature Reserve?
—No. You _________ until you have finished the report.
A．needn't B．mustn't C．won't D．shouldn't

全面解析：—我可以和我们同学们呢去自然保护区观鸟吗？—不，直到你已经完成了报道你才可以。A. needn't不必；B. mustn't禁止；C. won't不会；D. shouldn't不应该。根据题意，故选B。

20．The clothes need _________, but you _________do that by yourselves.
A．washing; needn't B．washing; needn't to
C．to be washed; don't need D．to wash; don't need to

全面解析：根据句意“衣服需要洗了，但是你没必要自己洗”。衣服被洗，故用need doing=need to be done表被动，故排除D。又根据need既可作情态动词，又可作实意动词。当need做情态动词时，无人称和数的变化，后加动词原形，故排除B。当need做实意动词时，有人称和数的变化，要用need to do，故排除C。故选A。

21．—Where is Andy?
— He________ be in the library. He said he would borrow books in the morning.
A．must B．mustn't C．need D．needn't

全面解析：—Andy在哪里？—他一定在图书馆，他说他早晨将去借书。A. must 一定；B. mustn't 禁止；C. need需要；D. needn't不必。根据He said he would borrow books in the morning.可知，这里推测在图书馆的可能性很大。故选A。

22．—Mom, must I do the dishes now ?
—No, you ________. You _______ do it later.
A．mustn't; can B．needn't; can
C．can't; can't D．needn't; have to

全面解析：妈妈，我必须现在洗碗吗？-不……你……一会做。根据句意可知不必现在就做，可以一会做，故选B。

23．The red coat ______ be Tom's. He never wears red clothes.
A．can B．must C．can't D．mustn't

全面解析：这个红色的外套……是汤姆的，他从不穿红衣服。根据后文可知这个外套不可能是汤姆的，故选C。

24．— Is that man in a red T-shirt Mr. Smith?
— It______ be Mr. Smith. He is on the way to London now．
A．must B．mustn't C．can D．can't

全面解析：—那个穿着红色T恤衫的人是史密斯先生吗?—它不可能是史密斯先生。他现在在去伦敦的路上。A. must必须，一定（肯定推测）；B. mustn't 禁止；C. can 能； 能够； 可以；可能（表肯定推测，比must的可能性小）；D. can't不能；不可能，表否定推测。结合句意和语境可知选D。
25．—You don't have to take a raincoat. It isn't going to rain.
—Well， I am not sure. It ________ do.
A．must B．need C．may D．would

全面解析： —你不必带雨衣，不会下雨。—哦，我不确定呢。可能要下雨啊。由于I am not sure“我不确定”，所以作“可能”的推测。must一定；need需要；may可能；would将要。故答案选C。
26．— I'd like a pet, but I am busy all day.
— Goldfish are a good choice. You ________ feed them every day
A．needn't B．can't C．shouldn't D．mustn't

全面解析：—我想养只宠物，但我整天很忙。—金鱼是很好的选择，你不必每天喂它们。A.needn't 不必；B. can't 不能；C. shouldn't不应该；D. mustn't不准。根据句意及题干分析此题应选A。
27．—Is the man over there your new teacher?
—No, it _______ be him. He has gone to Shanghai for a meeting.
A．needn't B．mustn't C．can't D．must

全面解析：—那边的那个人是你的新老师吗？—不，不可能是他，他去上海开会了。A. needn't 不必；B. mustn't 千万别，表示禁止的意思；C. can't 当“不可能”讲，表示否定的推测；D. must必须，当“一定”讲，表示肯定的推测。根据后面的句子“He has gone to Shanghai for a meeting.”判断，这个人不可能是我的新老师，故答案为C。
28．— You need to learn to control yourself when hearing the exciting news.
— Yes, you're right. It ________ be easy, but it ________ be done.
A．may; can B．may; can't
C．may not; can't D．may not; can

全面解析：—当听到令人兴奋的消息时，你需要学会控制自己。—是的，你说的对，这可能不容易，但可以做到。may, can同为情态动词，前者是“可以，也许”的意思；后者是“能够”的意思。根据转折连词but判断句意为：控制自己的情绪不容易，但能够做到，前一个句子为否定句，后一个句子为肯定句，故答案为D。
29．— Where are you going for your summer holiday?
— We ________ go to Yun Nan, but we haven't decided yet.
A．should B．will C．may D．must

全面解析：——你暑假打算去哪儿？——我可能去云南，但是我还没有决定。A. should应该；B. will打算，将；C. may可以；D. must必须。情态动词的特点是后加动词的原形，这里表示推测用may。根据题意，故选C。

30．—Look! That man looks like Mr Brown.
—It __________ be him, for he _________ America.
A．can't; has been to B．may not; has gone
C．mustn't; has been to D．can't; has gone to

全面解析：-看！那个人看起来像Brown先生。-不可能是他，因为他去了美国。can't不可能；may not可能不；mustn't禁止，不要；has been to去过某地，已经回来了；has gone to去了某地，还没回来，go是不及物动词，后面需要跟介词to，才能跟宾语，故B不对。根据句意可知应选D。
31．—Is that Mr. Zhou?
—It be him. He has gone to Beijing.
A．may B．can C．can't

全面解析：——那是周先生吗？——不可能是他，他去了北京。may，可能，can，能，can't，不可能，根据 He has gone to Beijing，可知知用否定句，故选C。
32．—The tall man with glasses over there looks like our math teacher.
—It _________ be him. He has gone abroad.
A．may not B．mustn't C．can't D．needn't

全面解析：——那边那个戴眼镜的高个子男的看起来像我们的数学老师。——不可能是他，他已经出国了。may not也许不；mustn't（表示禁止）千万不要；can't不可能；needn't不必。故选C。

33．—I don't care what people think.
—Well, you ___. You're not alone in this world.
A．can B．may C．should D．will

全面解析：——我不关心人们怎么想。——哦，你应该（关心），这个世界上不只是你一个人。根据后一句You're not alone in this world可知是向对方提建议，故选C。

34．— Mum, may I go swimming now?
—Yes, dear, but remember that you___________go with your dad.
A．may B．can C．must

全面解析：——妈妈，我现在可以去游泳吗？——可以，亲爱的，但是记住你必须跟你爸爸一起去。may也许；可以；can能够；可以；must必须。根据句意可知表示强制，故选C。

35．—May we leave the classroom now?
—No, you ________. You ________ to leave until the bell rings .
A．mustn't; are allowed B．needn't; aren't allowed
C．don't have to; are supposed D．can't; aren't supposed

全面解析：——我们现在能离开教室吗？——不，你们不能。直到铃声响了你们才能离开。“May I/we...?”的否定回答用No, you can't/No, you mustn't；needn't=don't have to 意思是“不必”。be supposed to do sth ,应该做某事。not…until…直到……才……。根据题意可知是“到铃响前都不能离开教室”，故答案为D。

36． — We've ordered too much food. I eat any more.
—Never mind. Let' take it home.
A．can't B．mustn't
C．needn't D．shouldn't

全面解析：——我们已经点了太多的食物，我不能再吃了。——没关系，我们带回家吧。can't不能；mustn't必须不；一定不要；needn't不必；shouldn't不应该。根据句意可知选Ａ。

37．—What will the weather be like tomorrow?
—It____be rainy,cloudy or sunny.Who knows?
A．must B．might C．shall D．should

全面解析：句意:—明天的天气会是什么样子的？—可能有雨，也可能阴天或晴天，谁知道呢？must 一定，表示语气非常的肯定；might 可能，语气较弱；shall用于第一人称的一般疑问句中，表示征求建议或意见；should 应该。根据句意可知，说话人也不确定明天的天气是什么样的，故选B。
38．Just like weather, life _________ be beautiful all the time.
A．mustn't B．needn't C．can't D．wouldn't

全面解析：就像天气一样，生活不可能总是美好的。mustn't，千万别，一定不要，表示禁止。needn't不必，不需要。can't不能，不可能，表示猜测。all用于否定句，表示部分否定，不都是。故选C。
39．— Look, the man looks like Mr. Brown.
— It ________ be him, for he ________ Australia since last Thursday and hasn't returned.
A．can't; has gone to B．mustn't; has gone to
C．may not; has been in D．can't; has been in

全面解析：—看，那个男士看起来像布朗先生。—不可能是他，因为自从上周四他一直在澳大利亚，现在还没有回来。根据hasn't returned.可知，第一空用can't不可能；has gone to表示去某地了，还没有回来；因为有since自从某个时间以来，所以句子的谓语动词应该用持续性动词。故排除A；has been in表示在某地（带了一段时间）。故选D。
40．You'd better pull your car over to the side of the road if you ______ answer a phone call.
A．must B．will C．can D．may

全面解析：你最好把车停在路边如果你……接电话。根据句意可知如果你必须接电话要将车停在路边，故选A。

41．—Are you interested in shopping online?
—Not so much. We ______ see real products but pictures.
A．shouldn't B．can't C．mustn't D．needn't

全面解析：——你对网上购物感兴趣吗？——不是那么感兴趣。除了图片我们看不到真实的产品。A. shouldn't“不应该”；B. can't “不能”；C. mustn't“一定不要”；D. needn't“不必”。根据句意可知是不能看到真实的产品，故选B。

42．—Should I wear a suit for the concert tonight?
—No , you ________. It is not as serious as the one we went to last week .
A．mustn't B．needn't C．can't D．wouldn't

全面解析：—今天晚上我应该穿套装去参加音乐会？—不，你不必，这一个不像我们上周去的那个那样严肃。mustn't“禁止，不要”；needn't“不必，没有必要”；can't“不能”；wouldn't“不愿意”。根据句意可知，这个音乐会不是那么正式，所以没有必要穿套装。故应选B。

43．— you sing this song in English?
—Let me have a try.
A．May B．Must C．Need D．Can

全面解析：—你会用英语唱这首歌吗？—让我来试一试。May “可以”；Must“ 必须”；Need“需要”；Can“能，会”。根据对话的意思可知，这里问对方会不会，故应选D。

44．— What's the good point of shopping online?
— I think buyers ________ spend too much time going to shops.
A．needn't B．mustn't C．can't D．shouldn't

全面解析：-网上购物的优点是什么? -我想买家不必花太多的时间去商店。needn't情态动词，不需要。所以选A。

45．—Is that girl under the tree Mary?
—No,it ________be Mary, she is in Beijing now.
A．can't B．needn't C．shouldn't D．mustn't

全面解析：-那个在树下面的女孩是Mary吗？-不，不可能是Mary，她现在在北京。can't不可能；needn't不需要，没有必要；shouldn't不应该；mustn't禁止，不要。根据对话的意思可知，这里表示的是推测，表示否定的意思，应该用can't。故选A。
46．—Must I hand in the homework now?
—No, you ______. You can give it to me tomorrow.
A．mustn't B．needn't C．can't

全面解析：— 现在我必须交上作业吗？ — 不，你没必要。你可以明天把它给我。根据句意，结合语法知识，如果问句中含有must这个情态动词时，肯定答语需要使用must，否定回答使用needn't，表示没必要。故答案为：B.
47．—Is the tall man over there our head teacher?
—No, it be him. He has gone to Shanghai for a meeting.
A．must B．can't C．can D．mustn't

全面解析：-那边那个高个子的男人是我们的班主任吗？-不，他不可能是，他已经去上海开会了。must必须，一定；can't不可能；can可能，must会；mustn't禁止，不要。根据句意可知，这里表示推测，肯定句中用must；否定句用can't。故选B。


48．—I wonder where Tom is.
—I am not sure. He be in the library.
A．must B．can't C．might D．should

全面解析：——我想知道汤姆在哪里，——我不确定。他可能在图书馆。A. must必须，一定；B. can't不可能； C. might 或许； D. should应该。根据I am not sure.判断，此处表示没有把握性的推测，只能用might，答案为C。

49．We want students for the school show. If you _________ play the guitar, please talk to Mr. Zhang after school.
A．can B．may C．should D．must

全面解析：我们需要学生参加学校表演。如果你会弹吉他，请放学后告诉王老师。can能，会，表示能力； may可以，表示允许； should应该，表示建议或义务；must必须，表示要求。此处表示会弹吉他，故用情态动词can，故选A。


50．You ______ pay too little attention to your reading skills, as they are so important.
A．should B．mustn't C．can't D．needn't

全面解析：你不能不注意你的阅读技巧，因为他们是如此重要。should 应该；mustn't紧张，不要；can't不能；needn't不需要，没有必要。根据句意as they are so important可知应选C。