20.(2010·山东)I ________ have watched that movie—it'll give me horrible dreams.
A. shouldn't
B. needn't
C. couldn't
D. mustn't
[解析]句意:我本不应该去看那部电影——它会使我做噩梦的。shouldn't have done 本不该做,但是做了;needn't have done 本没必要做,但是做了;couldn't have done 不可能做了某事。无 mustn't have done 结构。根据题干所提供信息应选A项。
[答案]A
21.(2010·天津)Mark ________ have hurried. After driving at top speed, he arrived half an hour early.
A. needn't
B. wouldn't
C. mustn't
D. couldn't
[解析]句意:Mark 本不必那么匆忙。他极速行驶,最后早到了半个小时。needn't have done 表示过去不必要做的事情却做了。couldn't have done 表示过去不可能做了(某事);wouldn't have done 用在表示与过去事实相反的虚拟语气中;mustn't 表禁止,不用在此结构中。
[答案]A
22.(2010·天津)—John went to the hospital alone.
—If he ________ me about it, I would have gone with him.
A. should tell
B. tells
C. told
D. had told
[解析]句意:——约翰自己去医院了。——要是他(事先)告诉我,我就跟他去了。本题考查虚拟语气的 if 条件句的时态。根据第一句谓语动词 went,可知第二句的主从句为与过去事实相反的虚拟语气,故 if 从句谓语动词要用 had told。
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