CHỌN ĐÁP ÁN ĐÚNG (ỨNG VỚI A, B, C HOẶC D )ĐỂ HOÀN THÀNH CÁC CÂU SAU

33. He...London two years ago and I ...him since then.

A. left-hadn't seen B. left-haven't seen C. was leaving-haven't seen D. left-didn't seen