The desks and the chairs are in good order and the floor is so clean. The room _____

Câu hỏi :

The desks and the chairs are in good order and the floor is so clean. The room _____

A must has been cleaned

B must have cleaned

C must be cleaned

D must have been cleaned

* Đáp án

D

* Hướng dẫn giải

Phương pháp giải:

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