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          It is not polite to enter others’ rooms          knocking on the door.
           A. by                        B. with                 C. without
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          介詞。根據(jù)句意：沒有敲門就進(jìn)入別人房間是不禮貌的。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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