◎ 题干
This old custom has________ since the 18th century, and remains practically unchanged.    
A. handed down    
B. been handed down    
C. handed out    
D. been handed out
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“This old custom has________ since the 18th century, and remains practically unchanged. [ ]A. handed down B. been handed down C. handed out D. been handed ou…”主要考查了你对  【动词短语】【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。