I / regret / not / study /  enough /  pass / final...

Câu hỏi: I / regret / not / study /  enough /  pass / final exam

A. I had not studied hard enough and I passed the final exam.

B. I regret not studying  enough hard to pass the final exam.

C. I regret not studying hard enough  passing the final exam.

D. I regret not studying hard enough to pass the final exam.