There is some one ( )the door.是填介词at or on?

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Thereissomeone()thedoor.是填介词atoron?Thereissomeone()thedoor.是填介词atoron?Thereissomeone()thedoor.是填介词at

There is some one ( )the door.是填介词at or on?
There is some one ( )the door.
是填介词at or on?

There is some one ( )the door.是填介词at or on?
at the door 在门边

at
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behind