Thì Quá Khứ Hoàn Thành Tiếp Diễn — Bài Tập 3

He ______ as a teacher for five years before he became a writer.

The garden was beautiful because my mother ______ it for years.

Before the algorithm was perfected, it ______ inaccurate predictions for years.

The reporter ______ the politician for weeks before she finally got an interview.

She ______ all day, so she was exhausted.

The team ______ badly for months before the manager was fired.

The author ______ the sequel for so long that fans had lost hope.

The artist ______ with a new technique that no one had seen before his final exhibition.

The two leaders ______ secretly for months before the peace treaty was announced.

He ______ his car all morning before he finally got it to start.