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

Câu hỏi :

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

* Đáp án

B

* Hướng dẫn giải

Đổi when thành that

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

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