It was not until 1980 that they..........to learn english, A.began B.begin C.didn't begin D.to begin
2 câu trả lời
began
của cấu trúc not until: It is/ was not until + time word/ phrase/ clause + that + S + V
began
của cấu trúc not until: It is/ was not until + time word/ phrase/ clause + that + S + V