"In his absence, I would like thank to all concerned on my brother's________"
Ta có thành ngữ: on/in behalf of someone hoặc on/in someone’s behalf - thay mặt cho, đại diện cho ai.
Đáp án là A.
“In his absence, I would like to thank all concerned on my brother 's behalf. " (Do anh tôi vắng mặt, tôi xin thay mặt để cám ơn tất cả những ai có liên quan.)