问题
选择题
I _____ have written to him because he phoned me shortly afterwards.
A．ought to
B．must
C．couldn’t
D．needn’t
答案
答案：D
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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