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          Someone ______ at the door. Can you open it?
          A．knocksB．knocked
          C．is knockingD．was knocking
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：句意:有人在敲門，你可以去開一下嗎？knock敲，knock at the door是一個固定的短語，意思是敲門。根據(jù)句意和這個情景可知，現(xiàn)在有人正在敲門，故應該用現(xiàn)在進行時，故選C。A是一般現(xiàn)在時第三人稱單數(shù)形式；B是一般過去時；D是過去進行時。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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