John is a short,strange man.He lives ####### the twelfth floor in a tall apartment building#####处填 on in under 哪一个?

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John is a short,strange man.He lives ####### the twelfth floor in a tall apartment building
#####处填 on in under 哪一个?

on 词组搭配就是这样,在哪一层用介词on

on

on the twelfth floor 在12F