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

26. - KIEM TRA CHAT LUONG KY 1
KIEM TRA CHAT LUONG KY 1

26. I haven't met him since he...school.

A. left B. was leaving C. had left D. was left