—Have you found a new job Jim? — Not yet. I really regret the IBM's offer.A. to turn down

问题补充：

—Have you found a new job, Jim?

— Not yet. I really regret the IBMs offer.

A. to turn down

B. turning down

C. turned down

D. turn down

答案：

A. to turn down

(答案→)B. turning down

C. turned down

D. turn down

解析： 句意：--吉姆，你找到新工作了吗？--还没有，我真的后悔拒绝了IBM的工作机会。Regret表示“后悔”的时候，后面接动名词做宾语，所以选B。