A、At a fair. B、At a cafeteria. C、In a computer lab. D、In a shopping mall. AWhere did the conversation take place? 四个选项都是表示地点的介词短

W: Morning. Can I help you?
M: Well. I’m not really sure. I’m just looking.
W: I see. Well, there’s plenty to look at it again this year. I’m sure you have to walk miles to see each stand.
M: That’s true.
W: Er..., would you like a coffee? Come and sit down for a minute, no obligation.
M: Well. that’s very kind of you, but...
W: Now, please. Is this the first year you’ve been to the fair, Mr...
M: Yes, Johnson, James Johnson.
W: My name’s Susan Carter. Are you looking for anything in particular, or are you just interested in computers in general?
M: Well, actually, I have some specific jobs in mind. I own a small company, we’ve grown quite dramatically over the past 12 months, and we really need some technological help to enable us to keep on top of everything.
W: What’s your line of business, Mr. Johnson?
M: We’re a training consultancy.
W: I see. And what do you mean "to keep on top"?
M: The first thing is correspondence. We have a lot of standard letters and forms. So I suppose we need some kind of word processor.
W: Right. Well, that’s no problem. But it may be possible for you to get a system that does a lot of other things in addition to word processing. What might suit you is the MR5000. That’s it over there! It’s IBM compatible.
M: What about the price?
W: Well, the MR5000 costs 1,050 pounds. Software comes free with the hardware.
M: Well, I’ll think about it. Thank you.
W: Here’s my card. Please feel free to contact me.