By the time their children finish high school, they ________ for almost two years. A. are retiring B. are going to retire C. will be retiring D. will have retired

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By the time their children finish high school, they ________for almost two years.

are retiring

are going to retire

will be retiring

will have retired

Giải thích

"By the time..." (trước khi một thời điểm nào đó trong tương lai) => Thì tương lai hoàn thành

Cấu trúc: S + will + have + P2

=> By the time their children finish high school, they will have retired for almost two years.

Dịch: Khi con cái họ học xong trung học, họ sẽ nghỉ hưu được gần hai năm.