✔ 最佳答案
In:
talk about an area
talk about a position inside an area
e.g.
There is a bookshop in the shopping centre.
On:
talk about a position on a surface
talk about a level in a building
e.g.
The key rings are on the shelf.
At:
talk about an exact place
e.g.
Sally lives at 85 Nathan Road.
There are 53 shops at Rainbow Plaza.