He once went to school on foot when he was at primary school.

Câu hỏi:

He once went to school on foot when he was at primary school.

A.
He was used to going to school on foot when he was at primary school.

B.
He used to go to school on foot when he was at primary school.

C.
He went to school on foot only one time when he was at primary school.

D.
He never went to school on foot when he was at primary school

Đáp án đúng: B

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Trước kia anh ấy đi bộ đi học khi anh ấy học cấp 1.

= B. Anh ấy đã từng đi bộ đi học khi anh ấy học cấp 1.