问题 关于《新概念英语》第一册第97课 A small blue case的疑问

...L：I left a suitcase on the train to London the other day.ATTENDANT：Can you describe it,sir?MR.HALL：It's a small blue case and it's got a zip.There's a label on the handle with my name and address on it.ATTENDANT：Is this case yours?MR.HALL：No,that's not mine.ATTENDANT：What...

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