【单选题】Lydia really regrets _____ out of high school. She has really had to struggle to make a living because of that decision. A. drop B. to drop C. dropping D. dropped
【简答题】A.She has trouble getting along with the professor. B.She regrets having taken up much of the professor's time. C.She knows the professor has been busy. D.She knows the professor has run into trouble.