◎ 题干
His sister left home in 1998, and _________ since.
[     ]
A. had not heard of
B. has not heard of    
C. had not been heard of
D. has not been heard of
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“His sister left home in 1998, and _________ since.[ ]A. had not heard ofB. has not heard of C. had not been heard of D. has not been heard of…”主要考查了你对  【现在完成时的被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。