A、Greg’s mobile phone. B、Greg’s home phone. C、Greg’s office phone. D、she doesn’t call him back. C此题考查听细节的能力，解题的关键点在于听到“I am at

M: Greg speaking.
W: Greg, it’s Jane.
M: Hey there, how are you?
W: I’m good. Listen, I was wondering what you are doing later?
M: Hey, I’m at the office, do you want to call here? A landline is so much cheaper than a mobile.
W: Yes, true. This call must be costing me a fortune! I’ll call you back. Bye. (Jane calls Greg’s office)
M: Greg speaking.
W: Hey, it’s me. Anyway, I was wondering if you want to go to a bar opening tonight? It’s a really cool place. My friend gave me an invitation, but it completely slipped my mind, until today.
M: Sounds good. What about John?
W: No called him, he’s busy tonight.
M: Oh, so I’m the second choice?
W: Hey, you would have asked your girlfriend before me, wouldn’t you’? Anyway, I’m asking you now and you should be happy!
M: Hmmm... yes, OK. I’ve got nothing better to do. Is it free drinks?
M: Yep. Free drinks ALL night!