The last time I saw my grandmother was at my graduation ceremony.

49/50

I last saw my grandmother since my graduation ceremony.

I haven’t seen my grandmother since my graduation ceremony.

I didn’t see my grandmother since my graduation ceremony.

I have seen my grandmother was at my graduation ceremony.

Giải thích

Tạm dịch :

Lần cuối cùng tôi gặp bà tôi là ở lễ tốt nghiệp của tôi.

Giải thích : B

- The last time : lần cuối …= S + haven’t + v3 + since / for ..: không làm gì từ khi / trong bao lâu …