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          ﹣Why are the windows so dirty?
          ﹣Because we __________ them for a long time.
          A. have cleaned         B. haven’t cleaned         C. didn’t clean
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析: 句意：為什么窗戶那么臟？因?yàn)槲覀兒荛L(zhǎng)時(shí)間沒(méi)清潔了。for a long time很長(zhǎng)時(shí)間，for加時(shí)間表一段時(shí)間，用于現(xiàn)在完成時(shí)，窗戶臟的原因是沒(méi)有清潔，故選B.
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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