Câu hỏi :

Choose the best sentence -a, b, c, or d - made from the given cues.

A. When I arrived at 7 am, the post office which had just been opened 

B. When I arrived at 7 am, the post office had just been opened 

C. I arrived at 7 am when the post office had just been opened 

D. I arrived at 7 am at that time the post office had just opened

* Đáp án

* Hướng dẫn giải

Đáp án: B

Giải thích: Khi tôi đến lúc 7 giờ sáng, bưu điện vừa được mở

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