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          (2013·高考北京卷)Don’t turn off the computer before closing all programs，________you could have problems.
          A．orB．a(chǎn)nd
          C．butD．so
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          選A。題干的意思是：在關(guān)掉所有的程序之前不要關(guān)電腦，要不然你會遇到問題的。or否則，要不然，表示一種否定的條件；and連接表示順承的并列句；but連接表示轉(zhuǎn)折的并列句；so連接表示因果的并列句。由語境可知正確答案為A項(xiàng)。掌握并列連詞的用法以及前后分句的邏輯關(guān)系是解題關(guān)鍵。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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