20. I’d rather he________ here.

A. come　 　B. comes　

C. came 　　D. will come

答：C。①would rather (not)do ... 接省去to的不定式。②would rather后接从句，从句应用虚拟语气，谓语常用过去式。

19. Yesterday, Jane walked away from the discussion. Otherwise, she________ something she would regret later.

A. had said　　　　 B. said

C. might say　　　　 D. might have said

答：D。此题考查虚拟语气的含蓄条件句，相当于 If Jane had not walked away from the discussion, she might have said something she would regret later.

18. If it ______for the snow, we ______ the mountain yesterday.

A. were not, could have climbed

B. were not. could climb

C. had not been, could have climbed

D. had not been, could climb

答：C。根据yesterday这一信息词，可判断是与过去事实相反的虚拟语气。

17. I wouldn’t have succeeded___________ for his help then.

A. hadn’t it been　　　 B. were it not

C. had it been not　　　 D. had it not been

答：D。此题考查对虚拟语气倒装的掌握。if it weren’t for...和if it hadn’t been for…表示“多亏，要不是……的情况下”，也可用but for短语来表示。这两个句型倒装时仅需记住一句话：not总在“之后。如：We wouldn’t have finished the work had it not been for his help.要不是他的帮助，我们就不能完成这项工作。

16. The teacher demanded that the exam______　 before eleven.

A. must finish　　　 B. would be finished

C. be finished 　　　D. must be finished

答：C。在表示请求、命令、建议、要求的词后的从句中应使用(should)+动词原形的虚拟语气形式。如：He suggested that we be there in time.

15. -We could have gone there by bus.

　 -Yes, otherwise we _______ late.

A. weren’t　　　　　 B. hadn’t been

C. couldn’t be　　　 D. couldn’t have been

答：D。We could have gone there by bus 意为“我们本来是能够坐汽车去那里”，但实际上并没有坐汽车去那里，相当于 We didn’t go there by bus。若将这一真实情况变成一个与事实相反的嵌设，则为If we had gone there by bus, we couldn’t have been late。

14. If only he _________ quietly as the doctor instructed, he would not suffer so much now.

A. lies　　 　　　B. lay　　

C. had lain　　　 D. should lie

答：C。此题考查的是虚拟浯气的错综时间条件句，从句和主句在时间上不一致，从句所表示的是与过去事实相反的虚拟，而主句表示的是与现在事实相反的虚拟。

13.　 Without the air to hold some of the sun’s heat, the earth at night _______, too cold for us to live.

A. would be freezing 　　B. will be freezing

C. would be frozen cold　　 D. can freeze coldly

答：A。此题考查的是虚拟浯气的含蓄条件句，所谓含蓄条件句就是条件从句井非是用if引导的从句来表示的，而是通过上下文或介词短语来表示的。如：Under favora-ble conditions, we could have finished the work ahead of time. 要是在更有利的条件下，我们就会提前完成这项工作。He could have come, but he was busy then. =If he had not been busy then, he could have come.

12. ________it rain tomorrow, we have to put off the visit to Yangpu Bridge.

A. Were　　　　 B. Should　　　　

C. Would　　　　 D. Will

答：B。为虚拟语气的倒装句，相当于 If it should rain tomorrow 万一明天下雨。

11. The two strangers talked as if they ________ friends for years.

A. should be　　 　B. would be　　　

C. have been　　 　D. had been

答：D。从句子中时态talked可知asif引导的从句是与过去事实相反的虚拟语气，另外for years也是判断此答的重要信息。