This is a very difficult operation.It is essential that you

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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

答案选C
这里是虚拟语气从句应该用should+原形,should可以省略
it is +necessary等形容词后,that主语从句中虚拟形式使用,这类形容词包括necessary,important,essential,imperative,urgent,preferable,vital,advisable等,例如It is necessary that you listen to the teacher carefully.或者It is essential that you be able to pronounce every single word correctly.

This is a very difficult operation.It is essential that you This question is very (difficult),but that question is much It is essential that you ____on time.A.be B.are C .were D.be This is a data-intensive operation.We recommend that you con It is essential that these application forms ________ back a It is essential that these applicaton forms____backas soon a this question is very difficult ( ) i know that it is very difficult to stop smoking ,but you __ 1.This is a very difficult math problem that the students ca This question is not difficult. It's very s______. This question is very difficult.( )people can understand it. 1.This is not very difficult.______ can do it.