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				36．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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