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外语
I______have written to him because he phoned me shortly afterwards.
I______have written to him because he phoned me shortly afterwards.
admin
2012-02-18
45
问题
I______have written to him because he phoned me shortly afterwards.
选项
A、needn’t
B、oughtn’t to
C、wouldn’t
D、shouldn’t
答案
A
解析
needn’t have done sth.表示过去做了某事,但事后证明没有必要做。oughtn’t to/shouldn’t have done sth.表示过去做了不该做的事;wouldn’t have done sth.用在虚拟条件句过去时的主句中,表示如果具备了所指的条件就不会做某事。
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考博英语
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