key of the front door还是key to the front door?前门的钥匙 用to还是of?

key of the front door还是key to the front door?前门的钥匙 用to还是of?
key of the front door还是key to the front door?
前门的钥匙 用to还是of?

key of the front door还是key to the front door?前门的钥匙 用to还是of?
to.
固定搭配 the key to sth.

应该是to
这是个固定用法
类似的用法还有 dance to the music

to
钥匙要用to

of表示前门的钥匙
to表示门的钥匙，比如the answer to the question
问题的答案

门钥匙要用:the key to the front door

跟key连用的有to 和 for
例句：
1.你有开这门的钥匙吗？
Do you have a key to open the door with?
2.我们有房间门的钥匙和发动汽车的钥匙。
We have a key for the door of the house and a key for starting the car.

key后要用to的,比如the key to that answer.

是key to the front door

是key to the front door。门的钥匙,问题的答案都用to