2. 外语
  3. I_____have written to him because he phoned me shortly afterwards.

I_____have written to him because he phoned me shortly afterwards.

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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 havedone 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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