It is demanded that the plan out as soon as possible.A. must be carriedB. is to carry out

问题补充：

It is demanded that the plan out as soon as possible.

A. must be carried

B. is to carry out

C. carried

D. be carried

答案：

A. must be carried

B. is to carry out

C. carried

(答案→)D. be carried

解析：在It is demanded that… 这种结构的主语从句中，谓语动词用“ should + 动词原形”，should可以省略。