31.You ________ not get my support if you do such a thing.
A.must B.may
C.shall D.need
[解析]shall 与第二人称连用，表示警告，允许等语气。
[答案]C
32.—I just want to know. Please tell me, how much do you make an hour?
—If you ________ know, I make $20 an hour.
A.will B.shall
C.must D.need
[解析]must 表示“偏要，一定要”。
[答案]C
33.—What do you think of the American singer Lady Gaga's performance?
—Too crazy, but if she ________ come to China to hold concerts, I would buy tickets for her live show.
A. would B. could
C. should D. might
[解析]本题考查虚拟语气。句意：—你认为美国歌手 Lady Gaga 的表演怎么样?—太疯狂了，但是如果她能到中国来举行演唱会的话，我会买票看她现场演出。由语境可知，此处是 if 引导的虚拟条件句，叙述与将来事实相反，从句用 should do/过去式/were to do，主句用 would/could/should/might do，故C项正确。
[答案]C
34.Without Sir Tim, the father of the WWW, keeping up with the latest ________ so convenient.
A. would be B. wouldn't be
C. would have been D. wouldn't have been
[解析]本题考查虚拟语气。句意：若没有万维网之父 Tim 先生，跟得上最新信息就不会这么方便了。由语境可知，Without Sir Tim 为含蓄条件句，相当于 If there were not Sir Tim，叙述与现在事实相反，故主句谓语动词用“would/should/could/might+do”，故B项正确。
[答案]B
35.Look at the trouble I am in! If only I ________ more careful when driving.
A. was B. would be
C. had been D. should be
[解析]本题考查虚拟语气。句意：瞧瞧我的麻烦!要是我开车时小心点儿就好了!if only“但愿……，要是……就好了”，后接从句，从句谓语动词用虚拟语气，叙述与过去事实相反，谓语动词用 had done，故C项正确。
[答案]C
36.He is a poorly learned man, but he acts as though he ________.
A. is B. were
C. should be D. seems like
[解析]本题考查虚拟语气。句意：他学识浅陋，但他表现得好像很有学问的样子。as though/if 后接从句，如果从句表示的情况接近事实，从句用陈述语气;反之，如果从句表示的情况与事实相反或者是不太可能发生，从句用虚拟语气。由语境可知，此处叙述与现在事实相反，从句谓语动词用过去式(be 用were)，故B项正确。
[答案]B
37.It is strange that such a thing ________ in your school.
A. will happen B. happens
C. should happen D. happened
[解析]本题考查虚拟语气。句意：真奇怪，这样的事情竟然发生在你们学校。It is strange/surprising/astonishing/natural/necessary... that 句式结构中，从句谓语动词用 should do，should 可以省略。
[答案]C
38.—I find it astonishing that John ________ be so rude to me.
—In fact, he is always rude to others.
A. should B. must
C. might D. ought to
[解析]本题考查虚拟语气。句意：—我发现约翰对我这么粗鲁，真令我吃惊。—事实上，他总是对别人很粗鲁。解答本题的关键为 astonishing，其后接从句，从句谓语动词用 should do，故A项正确。
[答案]A
39.I don't think it is the right time that you ________.
A. will go B. went
C. go D. must go
[解析]本题考查虚拟语气。句意：我认为这不是你去的合适的时间。It's(high/about)time...结构中，从句谓语动词用 should do 或过去式，故B项正确。
[答案]B
40.What's your opinion of Mr Ling's request that we senior students ________ read English newspapers every day?
A. would B. should
C. must D. could
[解析]本题考查虚拟语气。句意：你认为凌老师让我们高中学生每天看英语报纸的要求怎么样啊?request“请求，要求”，后接名词性从句，从句谓语动词用 should do，should 可以省略。
[答案]B
41. Had I known about this computer program, a huge amount of time and energy ________.
A. would have been saved
B. had been saved
C. will be saved
D. was saved
[解析]句意：如果我了解这种电脑程序的话，就可以节约大量的时间和精力。本题考查虚拟语气。如果表示与过去事实相反的话，条件句采用过去完成时态(如果省略 if 可采用部分倒装结构)，主句谓语动词应采用“would+have+过去分词”的结构，故答案为A项。
[答案]A
42. “You ________ have a wrong number.”she said. “There's no one of that name here.”
A. need B. can
C. must D. would
[解析]句意：“你肯定打错电话了。”她说，“这儿没有叫那个名字的人。”此处情态动词表推测，由语境可知说话人对推测的事情把握较大，所以用 must (肯定，一定)。
[答案]C
43. Jack described his father, who ________ a brave boy many years ago, as a strongwilled man.
A. would be B. would have been
C. must be D. must have been
[解析]句意：杰克的父亲很多年前一定非常勇敢，因此杰克说他的父亲是一个意志坚定的人。本题考查情态动词表推测语气。由句中的 many years ago 可知是对过去的推测，故排除A、C;而B项表示可能性很小，故被排除。
[答案]D
44. Doctors say that exercise is important for health, but it ________ be regular exercise.
A. can B. will
C. must D. may
[解析]句意：医生说锻炼对健康很重要，但那必须是经常性的锻炼。A：可能;B：将会;C：必须;D：可能。
[答案]C
45. You ________ buy a gift, but you can if you want to.
A. must B. mustn't
C. have to D. don't have to
[解析]句意：你不必买礼物了，但是如果你愿意的话也可以买。根据句意可知此处须用否定形式，故排除A、C项;mustn't 表示禁止;don't have to 意为“不必……”。故答案为D项。
[答案]D
46. If he ________ my advice, he wouldn't have lost his job.
A. followed B. should follow
C. had followed D. would follow
[解析]句意：如果他(当时)接受我的建议，就不会丢掉他的工作了。本题考查虚拟语气。因为 if 条件句表示与过去事实相反，故采用过去完成时。
[答案]C
47. 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
[解析]句意：一定是汤姆把车停在这里的，因为只有他有车。此句用 must 表示肯定的推测。must have done 表示“(过去)一定做了某事”。may，can 和 should 也可用来表示推测。may 表示“可能，也许”，推测语气不肯定。can 一般用于否定句和疑问句中表示推测。should 表示“按理应该……”。
[答案]C
48. One of the few things you ________ say about English people with certainty is that they talk a lot about the weather.
A. need B. must
C. should D. can
[解析]句意：对于英国人你可以确定的为数不多的事情之一就是他们对天气谈论得很多。can 意为“可以”。need 意为“需要”，用作情态动词时常用于否定句、疑问句;must 意为“必须”;should“应该”。
[答案]D
49. But for the help of my English teacher, I ________ the first prize in the English Writing Competition.
A. would not win B. would not have won
C. would win D. would have won
[解析]句意：要不是我的英语老师的帮助，我不会在英语写作比赛中获得第一名。本题考查虚拟语气的用法。根据句意，可知主句应该使用否定式，而本句是与过去事实相反的虚拟语气，故答案为B项。与过去事实相反的虚拟语气主句的谓语用：would/should/could/might+have+过去分词。
[答案]B
50. The doctor recommended that you ________ swim after eating a large meal.
A. wouldn't B. couldn't
C. needn't D. shouldn't
[解析]句意：医生建议大量饮食后不要去游泳。recommend 后的宾语从句谓语动词应该用“(should+)do”。表示“命令、建议、请求、要求”的动词后加宾语从句时，宾语从句的谓语动词需用“(should+)动词原形”。
[答案]D
