He started to study at 2 o clock He is still studying now10/40He started to study at 2 o’clock. He is still studying now.He has been studying since 2 o’clock.He has been studying for 2 hours.He was studying since 2 o’clock.He usually studies for 2 hours.Giải thíchĐáp án: A Dịch: Anh ấy bắt đầu học lúc 2 giờ đồng hồ. Bây giờ anh ấy vẫn đang học.