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           Don’t leave your seat ________ all the papers have been collected by the teacher.
          A．a(chǎn)fterB．when
          C．sinceD．until
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          試題分析：句意：直到所有的試卷都被老師收起來才能離開你的座位。not…until…直到……才……。根據(jù)句意，故選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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