◎ 题干
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
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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 been heard of B.has not been heard ofC. had not heard of D, has not 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。