单项选择题

M: You look pale．Linda. Is everything all right
W: No．I lost my textbook on my way back from school．
M: Did you stop by any place
W: Yes. I stopped by a post office to buy some stamps．
M: Think carefully whether you put your book down．
W: Maybe you are right．I will go back and see if it is still there. Thank you．

Where did she stop by().

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