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          There’s no way of knowing why one man makes an important discovery         another man, also intelligent, fails.
          A．sinceB．IfC．asD．while
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          考查并列連詞。根據(jù)句意，前后兩句話為兩種情況的對比“為什么一個人會做出一個重要的發(fā)現(xiàn)，而另一個人，也很聰明，但是失敗了�！辈⒘羞B詞while表示對比。故選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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