i last saw him when i was a student

29. I last saw him when I was a student.

A. I didn’t see him when I was a student.

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B. I haven’t seen him since I was a student.

C. I hadn’t seen him from I was a student.

D. I not saw him from the time I was a student.

=> Câu thụ động thì lúc này trả thành: S + have / has + been + PII / ed + (by O)

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