《新概念英语》第一册第121课 The man in a hat 戴帽子的男士
Customer: I bought two expensive dictionaries here half an hour ago, but I forgot to take them with me.
Manager: Who served you, sir?
Customer: The lady who is standing behind the counter.
Manager: Which books did you buy?
Customer: The books which are on the counter.
Manager: Did you serve this gentleman half an hour ago, Caroline? He says he's the man who bought these books.
Caroline: I can't remember. The man whom I served was wearing a hat.
Manager: Have you got a hat, sir?
Customer: Yes, I have.
Manager: Would you put it on, please?
Customer: All right.
Manager: Is this the man that you served, Caroline?
Caroline: Yes. I recognize him now.