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          Usually pilots need about a decade of experience _______ they can be promoted to captain.
          A．a(chǎn)fterB．beforeC．thenD．when
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：考查連詞：A. after在…之后，B. before 在…前面，C. then那時，D. when當…時候，句意：通常，飛行員需要十年的經(jīng)驗才能被提升為機長。說明在被提升為機長前要十幾年的時間。選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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