◎ 题干
The boy ______ lost his backpack has to borrow books from his teachers.   

A. who              
B. whose                  
C. which                
D. whom
◎ 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“The boy ______ lost his backpack has to borrow books from his teachers.[ ]A. who B. whose C. whichD. whom …”主要考查了你对  【关系代词】【定语从句】  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。