【題目】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

【答案】B

【解析】本題考查動(dòng)詞的時(shí)態(tài)和語態(tài)。句意:他的妹妹從1998年離開家后就沒有音訊了。slnce表示從那以后,在本句中應(yīng)與現(xiàn)在完成時(shí)連用,所以應(yīng)選擇B項(xiàng)。

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