Question

Please don't stand up in class until you ________.

A．are told

B．will be told

C．are told to

D．will tell

Answer 1

C

试题分析：句意：只到你被叫到才能站起来。Not …until…直到…才…主句是将来时态，从句要用一般现在时态。故排除BD；此句，要用被动语态，故排除D；这里是tell sb to do的被动形式即sb be told to do；这里的to后省略了stand up；但是这里的to不能省略，故选C。