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: needn't have written
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: needn't have written