15000 bài tập tách từ đề thi thử môn Tiếng Anh có đáp án (Phần 1)

It was not until she could read and write when she was allowed to use smartphone. A. not until B. when C. allowed D. use

3100/5750

It was not until she could read and write when she was allowed to use smartphone.

not until

when

allowed

use

Giải thích

Đáp án B.

đổi when thành that.

Cấu trúc: It was not until … that + S-V.