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				When she came out, Mary looked a bit tired because she       the house.A. cleaned                   B. was         C. had cleaned                  D.had  been cleaning [解析]D:本題考查動(dòng)詞時(shí)態(tài).側(cè)重說明在she came out之前的動(dòng)作.D項(xiàng)為過去進(jìn)行時(shí).表示從過去某一時(shí)間開始到過去某一時(shí)間一直進(jìn)行的動(dòng)作.			【查看更多】
			


		
           
          


		
          
		
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           When she came out, Mary looked a bit tired because she _____the house.
            
          A. cleaned  B. was  C. had cleaned  D.had been cleaning 
          

			
          
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          .When she came out, Mary looked a bit tired because she _____the house.
            
          A. cleaned          B. was           C. had cleaned        D.had been cleaning 
          

			
          
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          When she came out, Mary looked a bit tired because she ____ the house.
            A. cleaned                 B. was cleaning             C. had cleaned                     D. had been cleaning
          

			
          
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          When she came out, Mary looked a bit tired because she     the house. 
            
          A. cleaned   B. was cleaning    C. had cleaned      D. had been cleaning
          

			
          
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          .When she came out, Mary looked a bit tired
because she _____the house.
          


          
 
          
  
  
          A．cleaned
          
            		
  
  
          B．was
          
            		
  
  
          C．had cleaned
          
            		
  
  
          D．had been cleaning
          
            		
 
          

          


           
          

			
          
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