The house design was unusual, having only a single door to the outside despite its size.
Beyond the single door on the right was his parents' room.
The single door split off to the right and the left.
The room where they worked had no windows and a single door.
"I have come too far to be stopped by a single door!"
Class E also had a single door at the back.
Before him was a table; beyond that a single door.
Also, there was but a single door, the one through which they had just entered.
There was a single door at the far right end of the room.
There were no windows in the room and but the single door.