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    _____ 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(yǔ)
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_____ 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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