Bộ câu hỏi: Thì và sự phối thì (Phần 1) (Có đáp án)

I an online class in Advanced Maths when the Wi-Fi got disconnected.

14/54

I ______ an online class in Advanced Maths when the Wi-Fi got disconnected.

attends

have attended

was attending

had attended

Giải thích

Chọn C