The reading room is in the second floor .哪里错了?

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Thereadingroomisinthesecondfloor.哪里错了?Thereadingroomisinthesecondfloor.哪里错了?Thereadingroomisinthesec

The reading room is in the second floor .哪里错了?
The reading room is in the second floor .哪里错了?

The reading room is in the second floor .哪里错了?
in改为on on the second floor在二楼

in改用介词on