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          Don’t turn off the computer before closing all programs, _________ you could have problems.
          A．orB．a(chǎn)ndC．butD．so
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A

          試題分析：句意：所有的程序關(guān)閉之前不要關(guān)上電腦，否則，你可能有問題。or 或者，否則； and 而且；   but 但是；so 所以。根據(jù)空格后you could have problems，可知如果不按照前面的去做，就會(huì)有問題。故選A。
          考點(diǎn)：
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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