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          We shouldn’t drink _______ we drive and we mustn’t drive if we’ve drunk.
          A．unlessB．beforeC．untilD．while
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：A. unless除非，B. before在…前面，C. until直到，D. while當…時候，句意：我們開車前不應該喝酒，如果喝酒了不能開車。所以選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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