This is a key （） the door可不可以填of?

This is a key （） the door可不可以填of? this is a key of the door修改病句 This is the key ____ the door.A.to B.of C.at D.in 英语翻译门的钥匙翻译为什么是 a key to the door 可不可以是a key of the door呢~ This is the key __the door. is there a key to the door This is a key ____ the front door.Why you try it at the back This is the key _______(介词)　the door . this is the key __the door,don't lost it This is a key to my door.(翻译) Is it the key to the door of for classroom a key to the door//to可以换成is吗?