He was about to do something when his mother suddenly shouted out. A. He was doing something when his mother suddenly shouted out B. He refused to do something about his mother suddenly shout
Giải thích
Đáp án đúng là: C
Giải thích: was about to do something = was on the point of doing something: dự định làm gì
Dịch: Anh ấy đang định làm gì đó thì mẹ anh ấy đột nhiên hét lên.