单项选择题
W: Can I help you
M: Yes. I bought this radio yesterday, but it doesn’t work now. I’d like to exchange it for another one.
W: Oh, dear. Yes, of course. Have you got your receipt
M: Yes, here it is.
W: Thank you. Just a moment, please.
A. In a store.
B. In a factory.
C. In a museum.