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           Nobody believed a 92-year-old man could run a marathon_______he passed the finishing line. People of all ages can challenge themselves.
          A．ifB．sinceC．untilD．unless
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：考查狀語從句連接詞。句意：沒有人相信一個92歲的老人能參加馬拉松，直到他跑到了終點線。每個年齡段的人都可以挑戰(zhàn)一下自己。not...until...直到......才......。If如果，表條件；since自從；unless除非。故選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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