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          —Has David finished his project yet?
          —I guess not. He       on it at lunchtime. Do you want me to confirm it?
          A．is working B．was working 
          C．has worked D．had worked 
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          

          解析試題分析：句意：--大衛(wèi)還沒有完成作業(yè)嗎?—我想沒有完成吧，他在午飯時間還在工作，你想要我證實一下嗎?根據(jù)I guess not. He       on it at lunchtime可知他在午飯的時間正在做，故用過去進行時。故選B。
          考點：考查動詞時態(tài)。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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