【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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