我在13中学上学用英语怎么说？

急！！！！！！！！！

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I study at No.13 Middle School.
我以前在这个学校经常这么说

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I study/studied at No.13 Middle School.

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i'm studying in NO.13 mindlle school

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I study in the 13th Middle school.

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I study in 13 middle school.

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I'm studying at the 13th Middle School.

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