When/ I/ arrive/ 7 am/ the post office/ open

7/15

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

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

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

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

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

Giải thích

Đáp án: B

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