In his absence, I would like to thank all concerned on my brother’s

1209/1926

In his absence, I would like to thank all concerned on my brother’s_______.

behalf

part

business

interest

Giải thích

Đáp án A
Ta có: on/in behalf of sb = on/in sb’s behalf (idm): thay mặt cho ai, đại diện cho ai
Dịch: Do anh tôi vắng mặt, tôi xin thay mặt để cám ơn tất cả những ai có liên quan.