第15题: [单项选择]What does the woman think of the swimming lessons A. They are too expensive. B. They are very rewarding. C. They are too easy. D. They are given by a strict teacher. 参考答案:B 答案解析:[听力原文] M: How are your swimming lessons going W: Very well. My teacher thinks I’m making prog
A. were not; could have climbed B. were not; could climb C. had not been; could have climbed D. had not been; could climb 参考答案:C 答案解析:要不是下雪,我们前天应该去爬山了。此句为虚拟语气,从句用过去完成时,主句用could+现在完成时,表示“与过去事实相反的情况”。