Please dont stand up in class until you .A. are toldB. will be toldC. are told toD. will

问题补充：

Please don stand up in class until you .

A. are told

B. will be told

C. are told to

D. will tell

答案：

A. are told

B. will be told

(答案→)C. are told to

D. will tell

解析：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。