题文
---Which floor do you live __________?
---The first floor. I live _________ Room 112.
| A．in / on | B．on / on | C．on / in | D．in / in |
---Which floor do you live __________?
---The first floor. I live _________ Room 112.
| A．in / on | B．on / on | C．on / in | D．in / in |
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