HÃY CHỌN MỘT ĐÁP ÁN ĐÚNG NHẤT (A, B, C HOẶC D) CHO MỖI CÂU SAU

2. John________ as a journalist since he ________ from university in 2000.

A. is working / graduate B. worked / graduated

C. had worked / will be graduate D. has been working / graduated