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
网友回答
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。