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          -----How long do you think it will be _____man can finally solve the problem of cancer?
          ------Well．it depends．
          A．whenB．untilC．a(chǎn)fter D．before
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          試題分析：考查連詞。本題考查it will … before …還有多久才能……。句意：——你認為人類還要多久才能解決癌癥問題？——嗯，那還得看情況。故D正確。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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