3.Why hasn’t he come?________on time,we would have to put off the trip.
A.If he doesn’t come
B.If he will not come
C.If he didn’t come
D.If he wouldn’t come
解析:选C。表示对将来情况的虚拟,从句中的结构是:①if+主语+动词过去式(be动词用were);②if+主语+were to+动词原形;③if+主语+should+动词原形。主句结构是:主语+would/could/might/should+动词原形。
4.The new airport________if they had not stopped working on it.
A.would complete
B.had been completed
C.had completed
D.would have been completed
解析:选D。表示对过去情况的虚拟,从句结构是“if+主语+动词过去完成式”,主句结构是“主语+would/could/might/should+have+过去分词”。
5.(2016·杭州质检)There was a lot of fun at yesterday’s party.You________,but why didn’t you?
A.should come
B.must have come
C.may have come
D.ought to have come
解析:选D。句意:昨天的晚会很有趣。你应该来的,可你为什么没来呢?ought to have come表示“本该来而没来”;should come表示“现在应该……”;must have come表示“想必是/一定是来了”;may have come表示“或许已经来了”。
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