I have written to him because he phoned me shortly afterwards.A. ought toB. mustC. couldn

发布时间：2020-08-17 12:31:34

I      have written to him because he phoned me shortly afterwards.

A. ought to
B. must
C. couldn’t
D. needn’t

网友回答

A. ought to
B. must
C. couldn’t
(答案→)D. needn’t
解析：needn’t have done“本来不必做”，隐含实际上已经做了，从下文 “此后不久他就给我打了电话”可知用needn’t have written to him。
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