They haven't met each other for quite some time. →It has been
Giải thích
Đáp án đúng: It has been quite some time since they met each other.
Cấu trúc: S + have/has + not + Ved/3 + for + (time) = It has been + time + since + S + last + Ved/2
Hướng dẫn dịch: Đã khá lâu kể từ khi họ gặp nhau.