Hissisterlefthomein1998,and______since.A.hadnotbeenhea...
問題詳情：
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句意為：他的妹妹在1998年離開家，自從那時就沒有音訊了。用現在完成時的否定結構。
知識點：現在完成時及其被動式
題型：選擇題
