Don’t discuss the problems with your partner unless you to do so.A. askB. are askedC. wil

问题补充：

Don’t discuss the problems with your partner unless you to do so.

A. ask

B. are asked

C. will ask

D. will be asked

答案：

A. ask

(答案→)B. are asked

C. will ask

D. will be asked

解析：此题考查一般现在时的被动语态的基本构成。