A)dose not take
B)not to take
C)had not taked
D)did not take
13、I’d rather you____make any comment on the issue for the time being.
A)don’t
B)wouldn’t
C)didn’t
D)shouldn’t
14、It is vital that enough money____ to fund the project.
A)be collected
B)must be collected
C)is collected
D)can be collected
15、It is recommended that the project____until all the preparations have been made.
A)is not started
B)will not be started
C)is not to be started
D)not be started
16、The manager of the hotel requests that their guests____afeter 10:30 p.m.
A)couldn’t play loud music
B)don’t play loud music
C)shouldn’t play loud music
D)not to play loud music
17、____right now, she would get there on Sunday.
A)Would she leave
B)If she leaves
C)Were she to leave
D)If she had left
18、____for my illness I would have lent him a helping hand.
A)Not being
B)Had it not been
C)Without being
D)Not having been
19、We didn’t know his telephone number, otherwise we ____him.
A)would have telephoned
B)must have telephoned
大学英语语法-虚拟语气
C)would telephone
D)had telephoned
20、A safety analysis____the target as a potential dandger Unfortunately, it was never done.
A)would identify
B)will identify
C)would have identified
D)will have identified
21、If I hadn’t stood under the ladder to catch you when you fell, you____now.
A) couldn’t have smiled
B) wouldn’t be smiling
C) didn’t smile
D) won’t smile
22、____for the timely investment from the general public, our company would not be so thriving as it is.
A) Had it not been
B) Were it not
C) Be it not
D) Should it not be
23、If he knew this, it____be by accident.
A) would have to
B) didn’t to
C) won’t have to
D) woud have had to
24。If the whole operation______beforehand, a great deal of time and money would have been lost.
A )was not planned
B)has not been planned
C)had not been planned
D)were not planned
25、Jean doesn't want to work right away because she thinks that if she _____a job she probably wouldn't be able to see her friends very often.
A)has to get
B)were to get
C)had got
D)could have got
解析：
1、答案选C)。在it’s about time that…..句型中，定语从句的谓语动词应用过去时来表示虚拟语气。所以C项是正确的。
2、答案选D)。if only表示一种愿望，谓语用“would+动词原形”表示对将来事实的愿望，所以D是正确的。
3、答案选C)。在由it is necessary 等引导的主语从句要使用虚拟语气，虚拟语气的谓语动词用“should+动词原形”或动词原形。
4、答案选A)。由or引出的是与事实相反的假设条件，因此空缺处应填入表示虚拟语气的谓语动词。前一个分句中表示的是过去的时间，所以后一分句要用would have done的形式。
大学英语语法-虚拟语气
所以A是正确的。
5、答案选B)。本题中but分句中的it was 表明事情发生在过去，因此条件句应用过去完成时，表示与过去事实相反，所以B是正确的。
6答案选C)。根据虚拟语气的语法要求,that 从句中的动词用动词原形或“should+动词原形”的形式。所以C为正确选项。
7、答案选C)。requirement 后接一表语从句，从句的谓语用“should+动词原形”的形式来构成虚拟语气，四个选项中只有C符合。句意：产生火的必要条件之一是物质被加热到它的燃点。
8、答案选C)。as if引导一个表示与过去事实相反的虚拟语气的句子。主句的谓语动词是一般过去时，所以as if 后虚拟语气的谓语动词要用过去完成时，所以C是正确的。
9、答案选B)。be it selling goods or shipping them 是表示让步意义的虚拟倒装句，它是由whether it (might)be selling goods or shipping them这个句子省略whether后再将be 移至主语之前得来的。其它几项均不符合句子结构。句意：无论是售货还是运货，每天的业务都很不错。
10、选B。主句的谓语动词是wish时，其宾语从句用虚拟语气，表示与事实相反或不大可能实现的愿望。从本题的时间状语last spring可知，表示的是过去的愿望。因此从句应用于过去完成时表示，所以选B。
11、选A。从句中时间this morning 可知，本题表示对过去发生的事情表示遗憾，宾语从句的谓语须用过去完成时或could have done形式来表示虚拟语气，所以A项为正确答案。
12、选D。would just as soon的宾语从句的谓语动词用过去时来表示虚拟语气，符合语法规则的只有D项。
13、选C。for the time being意为”目前”，表示现在的时间，因些would rather表示现在不可能实现的愿望，要求从句使用过去时来表示虚拟语气，其否定形式为“didn’t+动词原形”。所以C为正确答案
14、选A)。本题中vital后的主语从句用“should+动词原形”的虚拟语气形式，省略了should，来构成从句的谓语，符合语法规则，为正确答案。
15、选D)。动词recommend表示“建议”，其后的宾语从句须用“should+动词原形”的虚拟语气形式，should可以省略。所以C为正确答案。
16、选C)。在本题中，动词request后的宾语从句用”should+动词原形”的虚拟语气形式，并且是否定形式。
17、答案选C。从句子结构可知，本题是表示与将来事实相反的虚拟语气。主句的谓语是“should+动词原形”。同时，从句省略了连词if, 可以将were提前，构成倒装。只以C符合语法规则。本题意思：如果她马上动身的话，她可能在星期天到达那里。