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
解析：考查動詞時態和語態 句意是：他的姐姐1998年離家，到目前沒有人聽到過她的消息，主語是他的姐姐，應用被動語態，又是到目前為止，所以應選擇B
知識點：其他
題型：選擇題
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