Hissisterlefthomein1998,and______since.A.hadnotbeenhea...
问题详情：
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
【回答】
B句意为：他的妹妹在1998年离开家，自从那时就没有音讯了。用现在完成时的否定结构。
知识点：现在完成时及其被动式
题型：选择题
