Please don’t stand up in class _____ you ______.A．until ; are told toB．when ; ar

题型：不详难度：来源：

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

A．until ; are told to

B．when ; are told

C．after ; were told

D．before ; were told to

答案

A

解析

试题分析：句意：在课堂上请到允许你时再站立。Not···until直到……才，是一固定句型；主句使用一般现在时，故时间从句也用一般现在时。Tell sb to do sth告诉某人做某事，改为被动语态后不可丢掉不懂事标记to。所以选A。