第20题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. Get Dr. Black’s written permission. B. Ask Dr. Black to call the library. C. Get the book directly from Dr. Black. D. Ask Dr. Black to change his decision. 参考答案:A 答案解析:[听力原文]
M:May I take this book out I need it to work on my paper for Dr.Black’s chemical class.
W: