选B
首先,前半句"please don't stand up",是祈使句,单词don't 说明应该用一般现在时态,排除A、C项.后半句是被动语态,“被告诉”应该用be told to.
所以结合前半句的一般现在时,应该选择B项
意思是：上课时请不要站起来,除非叫你这样做
please don't stand up in class until you_______.
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