2000 câu trắc nghiệm tổng hợp Tiếng Anh 2025 có đáp án (Phần 44)

________ then what I know today, I would have saved myself a lot of time and trouble over the years.

291/500

________ then what I know today, I would have saved myself a lot of time and trouble over the years.

Had I known

Did I know

If I know

If I would know

Giải thích

Đáp án: A