19) He didn’t work hard, so he failed the exam.
A. If he worked hard, he wouldn’t fail the exam.
B. If he hadn’t worked hard, he would have failed the exam.
C. He wouldn’t have failed the exam if he had worked hard.
D. He hadn’t failed the exam if he would have worked hard.
Bạn đang xem 19) - BÀI SOẠN GRAMMAR ENGLISH 10