I _____ have written to him because he phoned me shortly afterwards.
A．ought toB．mustC．couldn’tD．needn’t
D
needn’t have done“本來不必做”，隱含實(shí)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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