听力原文：
W: Hello, this is Mr. Green’s office. Who is speaking?
M: Hello, this is Bob Thomas speaking. Can I speak to Mr. Green?
W: I’m afraid not, he is at a meeting now.
M: Can I leave a message?
W: Yes, please.
M: Please ask him to give me a call at this number: 3336793.
W: Sure, I’ll give it to him.
M: Thank you very much. Goodbye.
W: Goodbye.
答案：4. C