第31题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. Three days and a half. B. Seven days and a half. C. A whole week. D. Half a day. 参考答案:B 答案解析:[听力原文]
W: How much time did you spend on the book
M: The first three parts are very difficult and