He ____________ abroad before I met him in Sydney.
A. studied
B. study
C. will study
D. had studied
Đáp án: D
Giải thích: cấu trúc QKHT before QKĐ
Dịch Anh ấy đã đi du học trước khi tôi gặp anh ấy ở Sydney
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Marie ___________ the dream of a scientific career which seemed impossible for a woman at that time.
Earl was one of the first American artists ___________ landscapes.
She had worked as a tourist guide before __________ a teaching career.
___________ having a private tutor, he couldn’t get good marks at school.
If you want to be a telephonist, you should _________ your communication skills.