Câu hỏi :

It is imperative ____ what to do when there is a fire.

A. he must know about

B. that everyone know

C. we knew

D. that he knew

* Đáp án

B

* Hướng dẫn giải

Đáp án B

Giải thích

It is imperative/essential/vital….  + that+ S+ (should)+ Vnt

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