(英语)高考英语情态动词模拟试题
高中英语情态动词练习(附答案)
高中英语语法练习-情态动词一、基础练习1.He ___ have completed his work; otherwise, he wouldn't be enjoying himself by the seaside.A. shouldB. mustC. wouldn'tD. can't2. I _____ have been more than six years old when the accident happened.A. shouldn'tB. couldn'tC. mustn'tD. needn't3. This cake is very sweet. You ____ a lot of sugar in it.A. should putB. could have putC. might putD. must have put4. He paid for a seat, when he ____ have entered free.A. couldB. wouldC. mustD. need5. I was on the highway when his car went past followed by a police car. They ____ at least 150 kilometers an hour.A. should have been doingB. must have been doingC. could have doneD. would have done6. — Tom is never late for work. Why is he absent today?— Something __________ to him.A. must happenB. should have happenedC. could have happenedD. must have happened7. - Do you know where David is? I couldn't find him anywhere.- Well. He _______ have gone far-his coat is still here.A. shouldn'tB. mustn'tC. can'tD. wouldn't8. -Lucy doesn't mind lending you her dictionary.- She __________. I've already borrowed one.A. can'tB. mustn'tC. needn'tD. shouldn't9. - Catherine, I have cleaned the room for you.- Thanks. You _____ it. I could manage it myself.A. needn't doB. needn't have doneC. mustn't doD. shouldn't have done10. There________ be any difficulty in passing the road test since you have practised a lot in the driving school.A. mustn'tB. shan'tC. shouldn'tD. needn't11. - The woman biologist stayed in Africa studying wild animals for 13 years before she returned.-Oh, dear! She ________ a lot of difficulties!A. may go thoughB. might go throughC. ought to have gone throughD. must have gone though12. -I've taken someone else's green sweater by mistake.-It ______ Harry's. He always wears green.A. has to beB. will beC. mustn't beD. could be13. Helen _______ go on the trip with us, but she isn't quite sure yet.A. shallB. mustC. mayD. can14. If I ________ plan to do anything I wanted to, I'd like to go to Tibet and travelthrough as much of it as possible.A. wouldB. could C have to D. ought to15. You might just as well tell the manufacturer that male customers_____ not like the design of the furniture.A. mustB. shallC. mayD. need16. -Who is the girl standing over there?- Well, if you ______ know, her name is Mabel.A. mayB. canC. mustD. shall17. Children under 12 years of age in that country______ be under adult supervisionwhen in a public library.A. mustB. mayC. canD. need18. "The interest ______ be divided into five parts, according to the agreement madeby both sides," declared the judge.A. mayB. shouldC. mustD. shall19. -- I'll tell Mary about her new job tomorrow.--You _______ her last week.A. ought to tellB. would have toldC. must tellD. should have told20. I ______ pay Tom a visit, but I'm not sure whether I will have time this Sunday.A. shouldB. mightC. wouldD. could21. --I don't mind telling you what I know.--You ________. I'm not asking you for it.A. mustn'tB. may notC. can'tD. needn't22. --Excuse me, but I want to use your computer to type a report.--You________ have my computer if you don't take care of it.A. shan'tB. might notC. needn'tD. shouldn't23. --Excuse me. Is that the right way to the Summer Palace?--Sorry, I'm not sure, but it ______ be.A. mightB. willC. mustD. can24. --Mum, I've been studying English since 8 o'clock. ________ I go out and playwith Tom for a while?--No, I'm afraid not. Besides, it's raining outside now.A. can'tB. wouldn'tC. may notD. won't25. I often see lights in that empty house. Do you think I _____report it to the police?A. shouldB. mayC. willD. can26. Mr. White_______ at 8:30 for the meeting, but he didn't show up.A. should have arrivedB. should arriveC. should have had arrivedD. should be arriving27. You ________ be tired-you've only been working for an hour.A. must notB. won'tC. can'tD. may not二、提高练习1．--- Shall I tell John about it?--- No, you ______. I’ve told him already.A. needn’ｔB. wouldn’ｔC. mustn’ｔD. shouldn’ｔ2. --- There were already five people in the car, but they managed to take me as well.--- It ______ a comfortable journey.A. can’t beB. shouldn’t beC. mustn’t have beenD. couldn’t have been3. --- Why didn’t you come to see me?--- I ______, but I was too busy yesterday.A. like toB. should like toC. would like to haveD. am going to-behaved gentleman ______ be so rude to a lady.4. You can’t imagine that a wellA. mightB. needC. shouldD. would5. There was plenty of time; she ______.A. mustn’t have hurriedB. needn’t have hurriedC. may not have hurriedD. wouldn’t have hurried6. --- Is John coming by air?--- He should, but ______ not. He likes taking trains.A. mustB. canC. needD. may7. --- ______ it be Li Ping who broke the glass?--- No. It ______ be Wang Hai who did it.A. Could; mayB. Can; canC. May; mustD. Can; must8. When the old man was alive, he ______ sit for hours at the door.A. wouldB. couldC. mustD. might9. Jack, you ______ play with the knife; you ______ hurt yourself.A. won’t; can’ｔB. mustn’t; mayC. shouldn’t; mustD. can’t; should10. I’ve decided to take the job and I ______ change my mind.A. mustn’ｔB. can’ｔC. won’ｔD. may not11. She ______ into the thick forest alone on such a dark night.A. dares not goB. dares not to goC. dare not to goD. doesn’t dare to go12. My parents never remember my telephone number, and they always ______ look it up.A. mustB. canC. shouldD. have to13. --- Where is Jack? I can’t find him anywhere.--- He ______ his homework upstairs.A. might have doneB. must have doneC. might be doingD. must do14. He ______ you more help, even though he was very busy.A. might have givenB. might giveC. may have givenD. may give15. --- If he ______, he ______ that food.--- Luckily he was sent to the hospital immediately.A. was warned; would not takeB. had been warned; would not have takenC. would be warned; had not takenD. would have been warned; had not taken16. --- I hear you've got a set of valuable Australian coins. ____I have a look ?--- Yes, certainly.A. DoB. MayC. ShallD. Should17. — When can I come for the photos? I need them tomorrow afternoon.。
英语情态动词题20套(带答案)含解析
【解析】
【详解】
考查must have done结构。句意：——吉姆一定觉得我说的话很让人烦，尽管他什么也没说。——所以你是说你得向他道歉？根据“though he didn’t say anything.”可知此处表示对过去事情的肯定推测，用must have done表示“过去一定做了……”，故D项正确。
2、should作为情态动词,可以用在条件状语从句中,表示语气较强的假设,译作“万一”、“竟然”,这时也可将should置于从句之首,即将should放在主语前面,而省略从属连词if。例如：If you should fail to come, ask Mrs Chen to work in your place.（= Should you fail to come, ask Mrs Chen to work in your place.）
A．mayB．canC．mustD．ould
【答案】C
【解析】
【详解】
考查情态动词表猜测的用法。句意：一定是汤姆把车停在这儿的，因为他是唯一有车的人。A. may可能；B. can可能；C. must一定；D. should应该。由as he is the only one with a car.可知一定是他把车停在这里的，非常有把握的肯定推测，故选C。
2．One of our rules is that every student _______ wear school uniform while at school.
A．mightB．could
C．shallD．will
【答案】C
【解析】
【详解】
考查情态动词辨析。句意：我们其中一条规则要求每个学生在校期间都要穿校服。shall可以表示“命令，警告，强制要求；允诺；法律，规定要做……”，结合句意可知C正确。
高考英语情态动词专项训练100(附答案)
考查虚拟语气。句意：我们将对我们的计划做最后决定。如果你改变主意，请尽快通知我们。根据语境，此处用虚拟语气，表示与将来相反，从句用should+动词原形，省略if，should提前，陈述句是：If you should change your mind……。故选A。
【答案】D
【解析】
【详解】
考查情态动词+ have done。句意：天气转晴了。我本不必费心把伞带在身边。A. should have taken本应该做某事，而实际上没做；B. must have taken对过去发生的事情的肯定猜测；C. couldn't have taken不可能；D. needn't have taken本来不需要，故选D。
A．mightB．must
C．canD．should
【答案】B
【解析】
【详解】
考查情态动词辨析。句意：天气很冷而且地面是湿的，昨晚一定下了雨。根据上文the ground is wet可知，“昨晚下了雨”是肯定的，故用must have done“必定做了……”表对过去十分有把握的推测，故选B。
【点睛】
2．Keep up your spirits even if you _____ fail hundreds of times.
A．mustB．need
C．mayD．should
【答案】C
【解析】
【详解】
考查情态动词。A. must必须；B. need需要；C. may可能，或许；D. should应该。句意：即使失败了几百次，也要振作起来。此处表示一种不确定的推测，故选C。
中国学生的常见病句是：They...; they certainly have arrived.病句的句义是“他们当然已经到达了。”（这不是对过去的肯定推测，而是断定动作已经完成。）
(英语)高三英语情态动词专项训练100(附答案)含解析
4. shall用于第二、第三人称，表示说话人给对方命令、警告、允诺或威胁。如：You shall fail if you don't work harder.（警告）He shall have the book when I finish reading.（允诺）He shall be punished.（威胁）
3．Our English teacher is considerate，helpful，and warm-hearted，but sometimes she________________ be angry at our silly mistakes.
A．shouldB．must
C．canD．shall
【解析】
【详解】
考查情态动词+have done。句意：“昨晚10点左右你给我打了电话，是吗？”“不，我没给你打电话。一定是别人干的。” must have done是对过去发生的动作最有把握的猜测，意思是“一定”，结合语境可知，我没有打电话给你，因此猜测一定有别人给你打了电话。故选A项。
9．Lack of sleep _______ lead to weakened immunity and memory, and also slow physical growth.
A．shallB．mustC．shouldD．can
【答案】D
【解析】
【详解】
考查情态动词辨析。句意：睡眠不足会导致免疫力和记忆力下降，还会减缓身体发育。A. shall将；B. must必须；C. should应该；D. can会，表示理论上或是逻辑判断上，用can，故选D。
高中英语情态动词专题练习(含答案)
高中英语情态动词专题练习(含答案)1.---- Look。
it ________ be Lao Wang.No。
it ________ be him。
He has gone abroad.A.may。
mustn’tB。
must。
may notC。
must。
can’tD。
can。
may not2.---- I’ve XXX.It ________ Harry’s。
He always wears green.A.would beB。
will beC。
could beD。
have to be3.Where ________ that noise be coming from?A.XXX.If it is the best thing to do。
it cannot be done ________ soon.A.XXX.I ________ XXX.A.XXXC.XXX6.I really appreciate ________ XXX.A。
XXX ________ walk for miles and miles among the XXX.---- Excuse me。
Is this the right way to the Summer Palace?Sorry。
I am not sure。
But it ________ be.A.XXX.I ________ go shopping this afternoon。
If I do。
I will buy some fruit.A。
XXX ________ always help us out financially when XXX.A。
XXX。
---- Who is the girl standing over there?Well。
if you ________ know。
her name is Mabel.A.XXX ________ you always leave your dirty clothes in the bedroom.A。
(英语)高考英语情态动词题20套(带答案)
一、单项选择情态பைடு நூலகம்词
1．AI will surely be a feature of future life, but it _____ be used responsibly and in a proper way.
A．canB．needC．mustD．will
考点：考查情态动词用法
点评：考本题是高考必考考点，一定要牢记句型意思。must have done过去肯定做了某事。should have done本应该做而实际未做。can’t have done过去不可能做了某事；shouldn’t have done本不应该做而实际做了。need have done本有必要做某事；needn’t have done本没有必要做某事；注意没有mustn’t have done的形式。
中国学生的常见病句是：They...; they certainly have arrived.病句的句义是“他们当然已经到达了。”（这不是对过去的肯定推测，而是断定动作已经完成。）
11．According to a newly released regulation on online video services, no one _____ generate, release or spread fake news or information by using such technologies.
Somebody must have stolen the ring.肯定有人偷了这枚戒指. [该句所推断的偷窃动作发生在过去.]
The temperature must have dropped to below zero last night, because the water is frozen all over.昨夜的温度肯定降到零度以下，因为水都冻住了。
(带答案)高考英语词法之情态动词典型例题及答题技巧
（带答案）高考英语词法之情态动词典型例题及答题技巧单选题1、Since the road is wet this morning, it________ last night.A．must rainB．must be rainingC．must have rainedD．must have been rained2、My umbrella is gone. Who ______________ have taken it by mistake? A．couldB．shouldC．wouldD．must3、Someone_________my umbrella.I found it wet.A．should have usedB．can't have usedC．must have usedD．could have used4、It ___________ last night, for the road was very muddy.A．would have rainedB．must have rainedC．should have rainedD．must rain5、—It’s really great to have a computer to store my photos.—Don’t count on it too much. It ______ break down and you’d better make a copy of them. A．mustB．canC．shouldD．need6、—Must I finish the paper today?— No, you _________.A．mustB．needC．couldn’tD．don’t have to7、“The interest be divided into five parts, according to the agreement made by both sides,” declared the judge.A．mayB．canC．mustD．shall8、You ________ worry about him. He will get well soon.A．needn'tB．can'tC．mustn'tD．may not9、—Must we hand in our homework now?—No, you_____. You may give it to me tomorrow.A．needn’tB．mustn’tC．can’t10、---I think you ______ there in person; a phone call would have been fine.---It’s OK and I was so glad to have seen your mum.A．couldn’t have beenB．shouldn’t beC．needn’t have beenD．wouldn’t be11、—Did you attend the meeting for the experiment project yesterday?—Yes, but I don’t think I ____ because m y director was there.A．need to haveB．need toC．needed toD．need have12、I’m surprised that he ________ in the match.A．should failB．should have failedC．would have failedD．may have failed13、Our English teacher is considerate，helpful，and warm-hearted，but sometimes she________________ be angry at our silly mistakes.A．shouldB．mustC．canD．shall14、Chris ________ go to the opera on Sunday because he is going to have a meeting.A．can’tB．mightC．mustn’tD．should15、My key isn’t in my back pack. Where on earth________ I have put it? A．canB．wouldC．shouldD．must16、---You ________ here all the way through the thick snow last night .There was nothing important.---Yes, but I didn’t know.A．didn’t need to comeB．don’t need to comeC．needn’t have c omeD．needn’t come17、According to the regulations, anyone who has the intention to be a teacher _______ pass a series of demanding tests.A．canB．wouldC．mightD．shall18、The girl _________ out alone at night.A．dare not goB．dare not to goC．dares not goD．not dare go19、He ______ be in the house. Look, that is his car!A．canB．can’tC．mustD．mustn’t20、— Professor, we need to talk about it now!—I’ m busy. If you _____ talk about it with me, please wait till I finish my work at hand. A．canB．mayC．mustD．should21、The designer has tried every possible way to make the robot light, so you_______worry about its weight. A．mustB．mayC．can'tD．needn't22、—Listen ! Helen is singing in the next room.—It be Helen. She has gone to Beijing.A．can’tB．mustn’tC．mayD．should23、She ________ return the book next week. I’m not sure.A．mayB．mustC．shouldD．would24、---Good morning. I’ve got an appointment with Miss Smith in the Personnel Department.---Ah, good morning. You be Mrs. Peters.A．mightB．mustC．wouldD．should25、Whatever_______happen,we are not going to give up our determined plan. A．mayB．mustC．canD．should26、You ________ be hungry after all that long walking.A．mightB．mustC．couldD．need27、Occasionally, small asteroids strike Earth. These cause little damage. Major collision, such as the one that_________ the dinosaurs, occur rarely--perhaps only once every 100 million years.A．may have killedB．should have killedC．must have killedD．could have killed28、—What is an ideal team leader like?—He ________ be responsible, determined and creative.A．canB．mayC．wouldD．should29、Reading a large number of books ________ make us wiser.A．shouldB．canC．needD．must30、It _____ have rained last night, because the ground is wet now. A．couldB．shouldC．mustD．need31、How fantastic his spoken English is! He_____ abroad for several years.A．may stayB．must have stayedC．can stayD．must have been staying32、You ________ walk on the wet hill path because you ________ fall and hurt yourself.A．must; might notB．mustn’t; mightC．needn’t; needD．must; must33、Tourists who enter the quiet area _____ obey the rule to reduce any potential effect on the environment.34、---Must I finish the work before you leave?---No, you ________. You can leave it tomorrow.A．must’ tB．needn’tC．ought not toD．won’t35、—Make sure that the door is fastened you go to bed.—But the door just ________close.A．while；doesn’tB．before；won’tC．after；won’tD．during；doesn’t36、—Excuse me, but I want to use your computer to type a report.—You _____ have my computer if you don’t take care of it.A．shan’tB．might notC．needn’tD．shouldn’t37、You ______ have carried all these parcels yourself. The shop would have delivered them if you had asked them. A．may notB．needn'tC．can'tD．mustn't38、He had known the matter before you told him, so you _________ have told it to him.A．mustn'tB．can'tC．needn'tD．shouldn't39、Life is unpredictable; even the richest ______ become the poorest. A．shallB．mustC．needD．might40、His opinion was shared by Chinese direc tor Feng Xiaogang.“Some young actors are feminine（女性化的） and they _____ be more manly,” he said during the Shanghai International Film Festival in June 2017. A．canB．mustC．mayD．should41、—Look, the boy is crying sadly.—Yes. From my point of view, his mother ________ not have punished him so severely.42、—That important document is nowhere to be seen.—Don't worry! You ___________ it somewhere. Calm down and think it over.A．might leaveB．might have leftC．should leaveD．should have left43、Linda__________go to see Jay Chou's performance this weekend, but it all depends on whether she can finish the task before Friday.A．mightB．mustC．needD．can .44、Sometimes it seems that doors ___________ be closed for you, but remember, they are not all locked. A．mustB．shouldC．mayD．need45、I ______ my friends and relatives during the Spring Festivals, but I had to stay home because of COVID-19 outbreak.A．should visitB．might visitC．would have visitedD．must have visited（带答案）高考英语词法之情态动词_00A参考答案1、答案：C解析：考查情态动词+have done结构。
最新高考英语情态动词题20套(带答案)
最新高考英语情态动词题20套(带答案)一、单项选择情态动词1．What a pity! Considering his ability and experience, he ___________ it better.A．need have done B．must have doneC．can have done D．might have done【答案】D【解析】【详解】考查虚拟语气中的情态动词。
句意：真遗憾啊！考虑到他的能力和经验，他也许可以做得更好。
can have done较少使用此结构，表示对过去行为的怀疑；用于疑问句时意为“难道真的做了吗”，表示怀疑；need have done需要做某事，实际上却未做（表示虚拟语气）；must have done一定做了某事（表示对过去发生的事情的肯定推测）；might have done表示对发生过的事情的推测，意思是“可能已经”或“也许已经”，用于肯定句中。
故D正确。
【点睛】本题是高考必考考点，一定要牢记句型意思。
must have done过去肯定做了某事。
should have done本应该做而实际未做。
can’t have do ne过去不可能做了某事；shouldn’t have done 本不应该做而实际做了。
need have done本有必要做某事而没做；needn’t have done本没有必要做某事；注意没有mustn’t have done的形式。
2．He ______ writing the paper now. He hadn’t written a single word when I left him ten minutes ago.A．shouldn’t be B．can’t have finishe dC．can’t be D．mustn’t have finished【答案】B【解析】【详解】考查推测句。
句意：他现在不可能写完了卷子。
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（英语）高考英语情态动词模拟试题一、单项选择情态动词1．—What’s wrong with you?—Oh, I am sick. I ________ so much ice cream just now.A．shouldn’t eat B．mustn’t eatC．couldn’t have eaten D．shouldn’t have eaten【答案】D【解析】【详解】考查情态动词和虚拟语气。
句意：——你怎么了？——我生病了，我刚才不应该吃那么多冰激凌。
A. shouldn’t eat不应该吃；B. mustn’t eat禁止吃；C. couldn’t have eaten不可能吃；D. shouldn’t have eaten本来不应该吃。
根据just now可知，是发生在过去，故选D。
2．—Did you attend the meeting for the experiment project yesterday?—Yes, but I don’t think I ____ because my director was there.A．need to have B．need to C．needed to D．need have【答案】D【解析】【分析】【详解】考查情态动词+have done。
句意：——你昨天参加实验项目的会议了吗?——是的，但我想我（本来）不需要，因为我的主管在那里。
Think/suppose等宾语从句中如果有否定词时，要把从句的否定词not前移，即“否定前移”。
所以not是从句中的否定词。
“need have done”意为“本来有必要做而未做”；“needn’t have done”指过去本来没必要做而做了。
根据上一句时间状语“yesterday”可知本句指的是过去发生的事。
结合第二句“because my director was there(我的主管)在”可推断出，我本来不必要去。
故选D。
3．Look! There are so many mistakes in your composition. You ________ have fixed full attention on it.A．can B．shouldC．need D．might【答案】B【解析】【详解】考查情态动词。
句意：看！你的作文里有那么多的错误。
你本应该把所有的注意力都集中在它上面的。
表示“本应该做但实际上没有做”应该用should have done结构，can have done 表示可能；need表示需要；might have done表示可能做过某事；故选B。
4．It ________ be the postman at the door. It's only six o'clock.A．mustn't B．can'tC．won't D．needn't【答案】B【解析】D[考查虚拟语气。
句意：不可能是邮递员在门口，才六点钟呢。
mustn't 禁止，不允许；can't 不可能；won't 不愿意，就是不，偏不；needn't 不需要。
]5．—You rang me up at about 10:00 last night, didn't you?—No, I didn't phone you. It someone else.A．must have been B．could be C．must be D．could have been 【答案】A【解析】【详解】考查情态动词+have done。
句意：“昨晚10点左右你给我打了电话，是吗？”“不，我没给你打电话。
一定是别人干的。
” must have done 是对过去发生的动作最有把握的猜测，意思是“一定”，结合语境可知，我没有打电话给你，因此猜测一定有别人给你打了电话。
故选A 项。
6．—Can I pay the bill by check?—Sorry，sir．But it is the management rules of our hotel that payment _____ be made in cash．A．shall B．needC．will D．can【答案】A【解析】【详解】考察情态动词用法。
句意：——我能用支票付账吗?——对不起,先生。
但这是我们酒店的管理规定,支付要用现金。
shall可以表示命令，警告，强制，或者指规则和法律要求做的事情。
本题正是考察了shall表示按照规则和法律要求做的事情。
故A正确。
7．I still find it hard to imagine that such a clever child __________ make such a foolish mistake. A．shall B．mustC．can D．should【答案】D【解析】【详解】考查情态动词。
句意：我仍然难以想象这样聪明的孩子竟然犯这样愚蠢的错误。
should 作为情态动词，可以用来表示意外、惊喜或者在说话人看来是不可思议的，常常译为"竟会"、"居然"，这么聪明的孩子竟然犯这样愚蠢的错误。
表示意外，shall表示允诺，命令等，must表示必须，can表示能力及可能性。
所以答案选D。
8．-–Mary knows the city quite well.--She______ well have been there before.A．need B．could C．should D．may【答案】D【解析】【分析】【详解】考查情态动词辨析。
句意：——Mary非常了解这个城市。
——她肯定以前在那里呆过。
may have done过去可能做过某事。
表示对过去的肯定猜测。
need have done本需要做某事却没做；could have done本可以做某事却没做；should have done本应该做某事却没做。
故选D。
9．It_____ have been Tom that parked the car here, as he is the only one with a car.A．may B．can C．must D．should【答案】C【解析】【详解】考查情态动词表猜测的用法。
句意：一定是汤姆把车停在这儿的，因为他是唯一有车的人。
A. may可能；B. can可能；C. must一定；D. should应该。
由as he is the only one with a car.可知一定是他把车停在这里的，非常有把握的肯定推测，故选C。
10．---We want someone to design the new art museum for me.---_____ the young fellow have a try?A．Shall B．May C．Will D．Need【答案】A【解析】【详解】考查情态动词。
句意：——我们想找人为我设计一个新的艺术博物馆。
——是不是让这位年轻小伙子试一试？shall作为情态动词,用于二三人称,表示"询问"，"警告"，"允诺"，"命令"，"决心"，"强制"等语气。
will作为情态动词，用于主语是各种人称的陈述句中，表示"意愿"和"倾向"。
用于第二人称的疑问句中，表"请求"。
故选A。
11．would可以表达过去常常做的事，过去习惯发生的动作：Pirates would bury gold in a cave. 海盗们常常把黄金藏在山洞中。
We would take a walk along the river. 我们过去常常沿河散步。
3. would后接like、love、mind等动词，表示要求、邀请、希望或询问，此时不是说过去，而是对现在的询问：Would you like to come to my party? 你愿意来我的派对吗？Would you mind coming with us? 你介意和我们一起吗？比如本题，would 表示婉转的请求，征求对方的意见，故选A。
12．Lack of sleep _______ lead to weakened immunity and memory, and also slow physical growth.A．shall B．must C．should D．can【答案】D【解析】【详解】考查情态动词辨析。
句意：睡眠不足会导致免疫力和记忆力下降，还会减缓身体发育。
A. shall将；B. must必须；C. should应该；D. can会，表示理论上或是逻辑判断上，用can，故选D。
13．he law is equally applied to everyone. No one _______ be above it.A．shall B．mustC．may D．need【答案】A【解析】【详解】考查情态动词。
句意：法律面前人人平等。
没有人能凌驾于法律之上。
A. shall用于第二、第三人称，则含有命令、警告、允诺或威胁的语气。
B. must（必须，一定）用于肯定句。
C. may（可以，能够）表允许时一般不与第三人称连用。
D. need (表示没有必要或询问是否有必要) 需要；故选A。
14．The accident which left 15 people on board dead ________ if both the angry female passenger and the bus driver had kept calm.A．should have avoided B．should be avoidedC．could have avoided D．could have been avoided【答案】D【解析】【详解】考查“情态动词+完成式”。
句意：如果愤怒的女乘客和巴士司机保持冷静，这起导致15人死亡的事故本来是可以避免的。
could have done“本来能做而没有做”，且句子主语The accident和谓语动词avoid之间是被动关系，结合句意可知答案为D。
【点睛】情态动词+ have done结构：1.“must + have + 过去分词”表示对过去发生的事情或状态进行推测，语气比较坚定，通常只用于肯定句。
如：It must have rained last night,for the ground is wet.2.“can / could + have + 过去分词”表示对过去某种情况的怀疑或不确定。