NATIONAL PARKSA. PHONETICSI. CHOOSE THE WORD WHOSE UNDERLINED PART IS...

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.