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
B
Dịch:
Khi tôi đến lúc 7 giờ sáng, bưu điện vừa được mở
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