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          Learning to write is learning to think. You don’t know things clearly _________ you can write
          them down.
          A．unless B．if C．since D．whether 
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          

          解析試題分析：句意：學(xué)習(xí)寫作就是學(xué)習(xí)思考。你不能清楚地知道事情除非你可以把他們寫下來。Unless除非；if如果； since從；whether是否。所以選A。
          考點：考查連詞。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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