题目内容
【题目】 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年离开家，自从那时就没有音讯了。由句意和since可知用现在完成时，且用否定结构。
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题目内容
【题目】 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年离开家，自从那时就没有音讯了。由句意和since可知用现在完成时，且用否定结构。