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          Don’t promise anything ________ you are one hundred percent sure.
          A．ifB．a(chǎn)fterC．whenD．unless
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          試題分析：if是否，如果；after在……之后；when當(dāng)……時；unless除非，如果不。句意：如果你不是百分之百的確定，不要承諾任何事情。故選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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