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				24．Yesterday  evening I was playing the piano      the doorbell rang.    A．when         B．before         C．while         D．a(chǎn)fter			【查看更多】
			


		
           
          


		
          
		
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          Yesterday evening I was playing the piano          the doorbell rang.
            
          A．when                         B．before                 C．while                  D．a(chǎn)fter
          

			
          
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          Yesterday evening I was playing the piano ________ the doorbell rang．
          

          

          [　　]
          

          A．when
          

          

          B．before
          

          

          C．while
          

          

          D．after
          

          

          

			
          
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