_____ 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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科目：高中英語 來源：同步題 題型：單選題

_____ 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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