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          【題目】Please don’t stand up in class until you ______.
          A. were told to B. are told
          C. are told to D. were told
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          【答案】C
          【解析】
          考查省略句。句意：直到有人叫你站起來，你才可以在課堂上站起來。在一定的上下文中，為了避免重復，動詞不定式在句中可以被省略掉，但是要保留動詞不定式的符號to。分析句子可知，本句為一般現(xiàn)在時。故C選項正確。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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