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

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

D


解析:

needn’t have done“本來不必做”，隱含實際上已經(jīng)做了，從下文 “此后不久他就給我打了電話”可知用needn’t have written to him。

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