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          Don’t stop working _____ twelve. 
          A．toB．a(chǎn)tC．whenD．until
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          考查not…until結(jié)構(gòu)。不要直到12點(diǎn)才停止工作，即不要工作到12點(diǎn)。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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