问题描述：
Please don·t stand up until you____
Please don·t stand up until you___
A are told to B are told 这个是选A,但什么情况下被动态的不定式符号可省略呢?
Please don·t stand up until you___
A are told to B are told 这个是选A,但什么情况下被动态的不定式符号可省略呢?
问题解答：
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