He has been working very hard for years. However,...

A

- Hướng dẫn giải

Phương pháp giải:

Giải chi tiết:

No matter how hard he has been working for years, he has not been promoted.

“No matter how…”: bất kể thế nào

No matter how hard he has been working for years: Bất kể anh ta đã làm việc chăm chỉ thế nào