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

20) I was tired because I stayed up late last night.

A. If I hadn’t stayed up late last night, I wouldn’t have been tired.

B. I hadn’t been tired if I wouldn’t have stayed up late last night.

C. If I had stayed up late last night, I would have been tired.

D. I wouldn’t be tired if I didn’t stay up late last night.

II. Choose the underlined part among A, B, C or D that needs correcting.