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、ought to
B、must
C、couldn’t
D、needn’t

答案D

解析 我本可以不给他写信的,因为他不多久就给我打电话了。
   Need not have done表示“其实本来不必……”,指过去已发生过的事,事实上没有必要。
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