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 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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