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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(shí)候，我正在做作業(yè)。”當(dāng)句中用when時(shí)，從句應(yīng)用過去時(shí)，主句用過去進(jìn)行時(shí)。所以本題選D。
          點(diǎn)評(píng)：本題比較容易和while引導(dǎo)的時(shí)間狀語從句響混淆。While引導(dǎo)的時(shí)間狀語從句中，主句可以用進(jìn)行時(shí)，也可用過去時(shí)，但從句應(yīng)該用進(jìn)行時(shí)。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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