A. Only during the first week of classes. B. Whenever students ask for them. C. Only in the afternoon. D. In the afternoon. 参考答案:A 答案解析:[听力原文]5-7 M: I'm here for the campus tour. F: I'm sorry. We only offer a guided tour during th
第35题: [单项选择]John ______ be could improve his exam results, but he did not have enough time to study. A. knows how B. knows that C. knew how D. knew that 参考答案:C 答案解析:考时态和连词。根据从句可判断为过去时,排除选项A和B。how表示如何,符合题意。选项c是正确的。