【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】句意：他的妹妹1卯8年離開家，自從那時就沒有音訊了。由句意和since可知用現(xiàn)在完成時，且用否定結(jié)構(gòu)。

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