This is a very difficult operation.It is essential that you ______英语解答

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：328 ℃　时间：2020-06-02 22:44:34

解答

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,advisab...