a key to the door 为什么用to

is there a key to the door 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~ the key to the door a key to the door//to可以换成is吗? the key to the door相关 I lose the key to the door. the key to the door is missing the man turned the key-----the lock and opened the door.a.to key of the front door还是key to the front door? 英语种key的用法,使the key to the door还是the key of the door? This is the key ____ the door.A.to B.of C.at D.in it′s very nice of you to help me find the key { }the door .A