Đề kiểm tra giữa kì 2 Tiếng anh 12 năm 2023 có đáp án (Đề 8)

I first met her four years ago when we at a middle school.

19/40

I first met her four years ago when we ___ at a middle school.

had been studying

are studying

have been studying

were studying

Giải thích

Chọn D