The key ____ the string was put into the door to stop the ki

the key to the door He lost the key ____ the door would do 和was to open when he ____ the door,he found his key the key to the door相关 I lose the key to the door. the key to the door is missing --Where she have put the key to the door?--- It maybe in the The key ____ for opening the door of the room. is there a key to the door This is the key ____ the door.A.to B.of C.at D.in 英语种key的用法,使the key to the door还是the key of the door? Yesterday I lost my key to the door,so I went into my house_