This is a very difficult operation.It is essential that you ________ for emergency
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
A.are to be prepared B.would prepared
C.be prepared D.must be prepared
英語人氣：693 ℃時間：2020-06-02 22:44:34
優(yōu)質(zhì)解答
答案選C 這里是虛擬語氣 從句應(yīng)該用should+原形,should可以省略 it is +necessary等形容詞后,that主語從句中虛擬形式使用,這類形容詞包括necessary,important,essential,imperative,urgent,preferable,vital,advisab...
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