第17题: [单项选择]A) He didn’t go to work this morning. B) He was injured and had to go to the hospital C) He talked with the professor in the morning. D) The traffic delayed him. 参考答案:D 答案解析:[听力原文] M: If the traffic wasn’t held up for so long, I would have been to class by ten o’clock. 第18题:[简答题]问题同上 参考答案:B. 通知双方(供电方、客户方)许可人