Could you tell me the difference between these three sentences?
I've bought a CD on Amazon.
I've bought a CD at Amazon.
I've bought a CD in Amazon (store).
'at' or 'in' is used for the physical location. 'at' is more usual in this usage. 'on' is used for the website.
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'at' or 'in' is used for the physical location.
'at' is more usual in this usage.
'on' is used for the website.
CJ