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				 -I knocked at your door, but nobody answer.   -You should       the door bell.    A. try touching     B. tried to touch   C. have tried touching  D. have tried to touch			【查看更多】
			


		
           
          


		
          
		
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          —I knocked at your door, but nobody answer.   
           —You should _____ the door bell.
             A. try touching      B. tried to touch     C. have tried touching D. have tried to touch
           
           
          

			
          
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