Please dont stand up in class until you.A. were told toB. are told toC. were toldD. are t

问题补充：

Please don stand up in class until you.

A. were told to

B. are told to

C. were told

D. are told

答案：

A. were told to

(答案→)B. are told to

C. were told

D. are told

解析：句意；课堂上，在有人叫你之前，请你不要站起来。结合语境可知下文从句描述的是可观性的动作，故用一般现在时态。主语是动作对象，故用被动语态。Tell后面接带to的不定式做宾语补足语，结合语境可知本句不定式符号不能省略，故选B。