用介词at,in,on,under,behind,near,of填空 The door( )the classroom is open.

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用介词at,in,on,under,behind,near,of填空 The door( )the classroom is open.
用介词at,in,on,under,behind,near,of填空 The door( )the classroom is open.

用介词at,in,on,under,behind,near,of填空 The door( )the classroom is open.
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