The lesson was so difficult that many students could not understand it.

39/40

The lesson was too difficult for many students to understand.

The lesson was too difficult for many students to understand it.

The lesson was such difficult that many students did not understand it.

The lesson was such difficult that many students could not understand.

Giải thích

Hướng dẫn giải:

Đáp án đúng: A

Cấu trúc tương đương: so … that ↔ too … to

Dịch nghĩa: Bài học quá khó nên nhiều học sinh không thể hiểu được.