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          ---Who cleaned the classroom?
          ---Mary ________.
          A．canB．doesC．didD．is
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          此題考查過去時的簡略回答，因其謂語動詞是行為動詞故其簡略回答要用did。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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