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          Mrs White _______ dinner when her son came home.
          A．is cookingB．was cookingC．a(chǎn)re cookingD．were cooking
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          對于懷特夫人的回家的時候，懷特夫人在做的事情應(yīng)該正在做，用進(jìn)行時，從句表示是過去，所以應(yīng)該用過去進(jìn)行時，主語為第三人稱單數(shù)，應(yīng)該用was+現(xiàn)在分詞，故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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