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          There is no way of knowing why one man makes an important discovery ______ another man, also intelligent, fails.
          A．sinceB．ifC．a(chǎn)sD．while
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D               

          試題分析：考查連詞辨析。A. since因?yàn)�；B. if 如果；C. as因?yàn)�；D. while 然而。句意：無(wú)法知道為什么一個(gè)人有了一個(gè)重要發(fā)現(xiàn)，而另一個(gè)人，同樣聰明，卻失敗了，”“while”是“而，卻，但是”的意思，表示轉(zhuǎn)折故選D項(xiàng)。
          考點(diǎn) : 考查連詞辨析
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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