It is imperative that every parcel on board ______ before the flight. must be checked

Câu hỏi :

It is imperative that every parcel on board ______ before the flight.

A. must be checked

B. is checked

C. were checked

D. be checked

* Đáp án

* Hướng dẫn giải

Đáp án : D

Sử dụng cấu trúc : It is imperative that + S + V nguyên thể: bắt buộc phải làm gì

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