6．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 解析:句意为:他的妹妹在1998年离开家.自从那时就没有音讯了.用现在完成时的 否定结构. 答案:B 【查看更多】
题目列表(包括答案和解析)
His sister left home in 1998，and ________ since．
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A．had not been heard of B．has not been heard of C．had not heard of D．has not heard of
