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				        at the door before entering, please.			【查看更多】
			


		
           
          


		
          
		
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          ______ at the door before entering please. 
          A．Knocked B．KnockC．Knocking D．To knock
          

			
          
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          ______ at the door before entering please. 
          


          A．Knocked          B．Knock            C．Knocking          D．To knock
          


           
          

			
          
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          _____ at the door before entering please.
            
          A. Knocked 　 B. To knock　 C. Knocking 　 D. Knock
              
           
          

			
          
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          ______ at the door before entering please.

          1. A.
            Knocked 
          2. B.
            Knock
          3. C.
            Knocking 
          4. D.
            To knock
          

			
          
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          ________
at the door before entering, please.
          

          A．Knocked
          

          B．To knock
          

          C．Knocking 
          

          D．Knock
          

           
          

          

			
          
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