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           When Jim’s mother came  in, he _____ his homework. 
              
                 A.  is doing                    B.  has done                   C.  was doing 
              
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          
    
    
        	
          
          【答案】C
              
          【解析】考查過去進(jìn)行時。由when引導(dǎo)的時間狀語從句可判斷出，主句中用過去進(jìn)行時。
                  
          
         
         
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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