A、Free. B、＄30. C、＄60. D、＄120. C本题的A、B、C都在原文中出现过，要注意区分的是George 的朋友拿到了免费票(free)，卖给 George ＄30一张(for ＄30 each)，Susan 吃惊地问：“你买两张票花了

George: Hi, Susan, I was wondering if you’re free tonight.
Susan: Well, George, I need to see my professor at four, and then I’m going to the supermarket, but I guess yes, I am. Why do you ask?
George: I have just received two tickets for Harry Porter from a friend of mine and was thinking of inviting you to go with me. Are you interested?
Susan: Yeah, definitely ! Thanks for inviting me!
George: No problem.
Susan: I really wanted to watch Harry Porter on the opening day but the pre-sale tickets were sold out. How did you manage to get hold of them?
George: A friend of mine works at the cinema. He was able to get the tickets for free, and then he sold two to me for ＄ 30 each.
Susan: You paid ＄ 60 for the tickets that he got for free? That’s really expensive!
George: Well, I guess it’s worthwhile considering the fact that other people are paying as high as ＄ 60 each on the "black market". Besides, I knew you were really looking forward to watching Harry Porter on the opening day.
Susan: Wow, I’m really honored you went through all this trouble just for my sake. I really appreciate that. So, what time are we going?
George: Well, let’s see. The movie starts at 10 pm. We should get there at least 1 hour earlier because there’ll be a big line. I could pick you up at your house at 8, if that’s OK with you.
Susan: Eight o’clock? That’s fine with me.
George: Okay good. See you then.
Susan: See you.