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				 While Helen      the piano, her mother came in.  A. was playing  B. is playing   C. played      D. plays			【查看更多】
			


		
           
          


		
          
		
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          While Helen _________the piano, her mother came in.           
          

          [     ]
          A. was playing   
          B. is playing     
          C. played        
          D. plays
          

			
          
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          While Helen ________ the piano，her mother came in．
          


          A．was playing        B．is playing          C．played            D．plays
          


           
          

			
          
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