I _______ to him because he phoned me shortly afterwards.

I _______ to him because he phoned me shortly afterwards.
A、need have written
B、needn't have written
C、must have written
D、may have written
【正确答案】：B
【题目解析】：needn't have done本不需要干某事
句意：我本来没有必要写信给他，因为他后来不久就给我打了电话。