15 Đề ôn thi thpt Quốc Gia môn Tiếng Anh có lời giải chi tiết (Đề số 13)

Mr. Pike _________ English at your school for 20 years before he retired last year. was teaching

19/50

Mr. Pike _________ English at your school for 20 years before he retired last year.

was teaching

has been teaching

is teaching

had been teaching

Giải thích

Đáp án D