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Please don’t stand up in class until you...

Please don’t stand up in class until you ______.

A. were told to    B. are told

C. are told to    D. were told

 

C 【解析】 考查省略句。句意:直到有人叫你站起来,你才可以在课堂上站起来。在一定的上下文中,为了避免重复,动词不定式在句中可以被省略掉,但是要保留动词不定式的符号to。分析句子可知,本句为一般现在时。故C选项正确。
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