it's__the first floor.A in B on Cat 选哪一个.谢谢求大神帮助

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it's__the first floor.A in B on Cat 选哪一个.谢谢求大神帮助
it's__the first floor.A in B on Cat 选哪一个.谢谢求大神帮助

it's__the first floor.A in B on Cat 选哪一个.谢谢求大神帮助
on,选B,on the floor是固定搭配,