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          ____ I'm mistaken, I've seen that tall man at a party before.
          A．IfB．AsC．UnlessD．When
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：句意：如果我沒(méi)有認(rèn)錯(cuò)的話，我以前在聚會(huì)上見(jiàn)過(guò)那個(gè)人。這里用unless引導(dǎo)條件狀語(yǔ)從句，意思是“除非，如果不”，if引導(dǎo)條件狀語(yǔ)從句，意思是“如果”，As“正如，因?yàn)椋S著”，when“當(dāng)…時(shí)候”，引導(dǎo)時(shí)間狀語(yǔ)從句。所以選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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