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

A began

=> Mốc thời gian trong quá khứ chia thì QKD

=> S + V2/ed+O

began

của cấu trúc not until: It is/ was not until + time word/ phrase/ clause + that + S + V

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