He lives ______ an apartment ______ the third floor.
- On/at
- In/on
- At/in
- None of these
Explanation
The preposition "in" is used when referring to a person being inside a building or an enclosed space, such as a house, a room, or an apartment.
The preposition "on" is used when referring to a specific level or floor of a building, because you are situated "on" a surface.
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