请教这题英语选择题为什么会选CThis is a very difficult operation. It is essential that you _____ for emergency.A. are to be preparedB. would preparedC. be preparedD. must be prepared

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请教这题英语选择题为什么会选CThis is a very difficult operation. It is essential that you _____ for emergency.A. are to be preparedB. would preparedC. be preparedD. must be prepared
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

请教这题英语选择题为什么会选CThis is a very difficult operation. It is essential that you _____ for emergency.A. are to be preparedB. would preparedC. be preparedD. must be prepared
是虚拟语气的用法之一吧.essential后要接动词原形

该题考点：1、被动语态；二、省略
该句完整形式是
It is essential that you should be prepared for emergency.
该句还用到倒装，原语句为
That you should be prepared for emergency is essential .

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