Đề thi thử thpt quốc gia 2019 môn tiếng anh (Đề số 13)

He _____________ for an international company before he became a teacher

20/50

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

He _____________ for an international company before he became a teacher.

has been working

has worked

was working

had worked

Giải thích

Đáp án D