Q: About in/on usage ....
on a mountain
on the mountain
on the mountains
on mountains
in a mountain
in the mountain
in the mountains
in mountains
("Unlikely but possible. I spent my holiday in a cave or a pothole" <-- 這個很好笑 )
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Neither a, b nor c is ...
http://groups.google.com/group/alt.usage.english/browse_thread/thread/a096dc0ad36e2670/9c25e63a9289d474
