我在農場工作的介系詞 是 in on at哪個?

in - used when the thing surrounds or encloses
on - used for the thing is a surface
at - used for a particular point
因為農場的地方面積普遍都是很大的，所以通常是說 "on a farm".

I live in a small apartment.
I live on a farm.
I live at 28 George Street.



So,

Where does he work?
He works on a farm.

Where does it work?
He works in a office?

Where does it work?
He works at the Town House.

2011-11-07 00:48:38 補充：
最後兩句的 "it" 打錯了 = =，應該是 "he" 才對！

2011-11-07 00:49:07 補充：
還有 "works in a office" --> "works in an office".