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          — The floor is clean and dry now. Who _______?
          — Sorry, I don’t know.
          A．mopped it upB．has mopped it upC．has mopped up itD．mopped up it
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          從題意來講，本題需要的是現(xiàn)在完成時，而mop ..up 為動詞+adv詞組，若賓語為人稱代詞時，位于中間，故選B
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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