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    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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