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    精英家教网 > 高中英语 > 题目详情
    _____ we call a machine is really a kind of tool that can do  work for man.        

    A. When                                
    B. That      
    C. What                              
    D. Which
    C
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    科目：高中英语 来源：同步题 题型：单选题

    _____ we call a machine is really a kind of tool that can do  work for man.        
    [     ]
    A. When                                
    B. That      
    C. What                              
    D. Which

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