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    I_______ my homework when the door bell__________.
    A．did, rangB．was doing, was ringing
    C．did, was ringD．was doing, rang
    			
    


			
    

		
    
		
		
	
    
		
    
			
    
				
    
				
    D

    試題分析：根據(jù)題干，本句的意思是“當(dāng)門鈴響的時候，我正在做作業(yè)�！碑�(dāng)句中用when時，從句應(yīng)用過去時，主句用過去進行時。所以本題選D。
    點評：本題比較容易和while引導(dǎo)的時間狀語從句響混淆。While引導(dǎo)的時間狀語從句中，主句可以用進行時，也可用過去時，但從句應(yīng)該用進行時。
    				
    
							
    
			
    
			
    
			
			
    
		
    
	
    

		
    

		





			
    
		
    
		
				
    
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