There are 30 classrooms ____________ our school. Mine is _____________ the second floor.
| A．on; in | B．in; in |
| C．in; on | D．on; on |
There are 30 classrooms ____________ our school. Mine is _____________ the second floor.
| A．on; in | B．in; in |
| C．in; on | D．on; on |
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