He went back to work in his country after he…….his course on Advanced Engineering in London

Câu hỏi :

He went back to work in his country after he…….his course on Advanced Engineering in London.

A. finishes

B. has finished 

C. had finished

D. was finishing

* Đáp án

C

* Hướng dẫn giải

Chọn C

Cấu trúc: After+QKHT, QKĐ: một việc diễn ra sau khi một việc trước đó đã hoàn thành.

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