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           Last night, before the exam, I went over the lessons　　　I couldn’t keep my eyes open to stay awake any longer.
          A．beforeB．untilC．unlessD．when
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          選B�？疾闋钫Z從句。句意: 昨天晚上, 考試前, 我復(fù)習(xí)功課直到我再也難以支撐的時候。until直到……的時候; before在……之前; unless除非; when當(dāng)……的時候。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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