第15题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. He left his lab and went on vacation. B. He locked his lab. C. He came back to work early. D. He went to give a lecture. 参考答案:C 答案解析:[听力原文]
M: Professor Benson is working in his lab this afternoon.
W: But his vacation isn’t over un