The canteen is the first floor.A.onThe canteen is the first floor.A.on B.at C.in填空

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The canteen is the first floor.A.onThe canteen is the first floor.A.on B.at C.in填空
The canteen is the first floor.A.on
The canteen is the first floor.
A.on B.at C.in
填空

The canteen is the first floor.A.onThe canteen is the first floor.A.on B.at C.in填空
A