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           — Why? Tom, your shirt is so dirty!
            
             — Mum, I ＿＿ my storeroom downstairs。
            
          A. cleaned      B. have worked    C. was cleaning    D. have been cleaning
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
             
          解析:
               
          現(xiàn)在完成進(jìn)行時(shí)表示從過(guò)去某時(shí)到現(xiàn)在一直在進(jìn)行的動(dòng)作。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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