Tom failed the exam because he didn’t study hard. A. If Tom had studied hard, he wouldn’t have failed the exam. B. If Tom didn’t failed the exam, he would study hard. C. If Tom hadn’t failed the exam, he would have studied hard. D. If Tom studied hard, he wouldn’t fail the exam.

Cách làm:
- Phân tích câu trước và sau "Tom failed the exam because he didn’t study hard" để xác định định dạng câu điều kiện.
- Sử dụng quy tắc của câu điều kiện trong tiếng Anh để đưa ra đáp án chính xác.

Câu trả lời:
A. If Tom had studied hard, he wouldn’t have failed the exam.
D. If Tom studied hard, he wouldn’t fail the exam.

E. If Tom had studied hard, he would not have failed the exam.

D. If Tom studied hard, he wouldn’t fail the exam.

C. If Tom hadn’t failed the exam, he would have studied hard.

B. If Tom didn’t failed the exam, he would study hard.