She had worked as a tourist guide before __________ a teaching career.
A. starting
B. start
C. to start
D. started
Đáp án: A
Giải thích: before + Ving: trước khi làm gì
Dịch Cô ấy đã làm việc như một hướng dẫn viên du lịch trước khi bắt đầu sự nghiệp giảng dạy
Earl was one of the first American artists ___________ landscapes.
Marie ___________ the dream of a scientific career which seemed impossible for a woman at that time.
___________ having a private tutor, he couldn’t get good marks at school.
If you want to be a telephonist, you should _________ your communication skills.