◎ 题干
_____ troubles me is _____ I don't know _____ is to be done with the new machine.
[     ]
A. What; what; that
B. What; that; how  
C. What; that; what
D. What; because; which
◎ 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“_____ troubles me is _____ I don't know _____ is to be done with the new machine. [ ]A. What; what; that B. What; that; howC. What; that; whatD. What…”主要考查了你对  【连接代词】【从属连词】  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。