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				 I was doing my homework       the door bell rang.A.  while        B. when        C. after        D. before			【查看更多】
			


		
           
          


		
          
		
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          I was doing my homework ________ the door bell rang.
          

          [     ]
          A.while           
          B.when          
          C.after            
          D.before
          

			
          
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