Đề kiểm tra học kì 2 Tiếng anh 12 năm 2023 có đáp án (Đề 27)

It was not until he failed the final examination he realized how important the

12/40

It was not until he failed the final examination _____ he realized how important the revision was.

that

who

what

and

Giải thích

Đáp án A