500 câu trắc nghiệm Tìm câu cận nghĩa trong tiếng Anh có đáp án - Phần 15
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He didn't know how to swim until he was 30

9/30

He didn't know how to swim until he was 30.

It was not until he was 30 that he knew how to swim.

He knew how to swim after his 30s.

It took him 30 years to know how to swim.

He still didn't know how to swim until his 30s.

Giải thích

Chọn đáp án A

Giải thích : cấu trúc it + be + not until + mốc thời gian + that + mệnh đề: không...cho đến tận khi...