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          精英家教網 > 高中英語 > 題目詳情
          
			
          
				
           The new system needs to be in operation for five months ________ it can be updated.
          A．asB．while
          C．beforeD．once
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          C考察狀語從句。本句的before用語肯定句中，強調主句動作持續(xù)的時間比較長，意為：要多多久….才。故C正確。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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