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          —Why didn’t you go to play football with us yesterday afternoon? 
          —I _____my mother with the housework then. 
          A．helped B．was helping C．had helped D．have been helping
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          過去進行時的用法。句意：－昨天下午你為什么不和我們?nèi)ヌ咦闱蚰�？－那時我正幫我母親做家務。表示過去的時間正在做某事，用過去進行時。故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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