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           I have a tight budget for the trip，so I'm not going to fly ________ the airlines lower ticket prices.(2012·上海，32)
          A．onceB．ifC．a(chǎn)fterD．unless
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          句意：我旅行的預算很吃緊，所以不打算坐飛機，除非航空公司降低票價。考查狀語從句。unless相當于if...not，符合前后句的邏輯。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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