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

Câu hỏi :

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

A. not until

B. when

C. allowed

D. use

* Đáp án

B

* Hướng dẫn giải

Đáp án B.

Đổi when thành that

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

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