in a summer camp和at a summer camp 哪个是对的?

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in a summer camp和at a summer camp 哪个是对的?
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in a summer camp和at a summer camp 哪个是对的?
in a summer camp和at a summer camp 哪个是对的?

in a summer camp和at a summer camp 哪个是对的?
at a summer camp 正确

at a summer camp

at a summer camp