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          Learning to write is learning to think. You don’t know things clearly _______ you can write them down.
          A．unlessB．ifC．sinceD．whether
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          unless 除非，如果不；if是否，如果；since由于，自從……以來(lái)；whether是否。句意：學(xué)習(xí)寫(xiě)作就是學(xué)習(xí)思考。如果你不能把它們寫(xiě)下來(lái)，你就不能了解事物。結(jié)合語(yǔ)境可知選A。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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