Question

His sister left home in 1998, and _______since.

A. had not been heard of       B. has not been heard of

C. had not heard of           D. has not heard of

Answer 1

B

解析:

C、D是主动语态，hear of表示“听说”，后面应该有宾语。前句意思是“他妹妹1998年离开的家”，说明1998年前有音信，由此可判断下句意思是“她妹妹从1998年到现在以来才没有音信的（被听说过）”，因此是现在完成时态。