请教这题英语选择题为什么会选C
This is a very difficult operation. It is essential that you _____ for emergency.
A. are to be prepared
B. would prepared
C. be prepared
D. must be prepared
人气：384 ℃ 时间：2019-08-31 09:56:50
解答
是虚拟语气的用法之一吧.essential后要接动词原形
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