Do you know the key to the problem?为什么用to不用for

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Do you know the key to the problem?为什么用to不用for
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Do you know the key to the problem?为什么用to不用for
Do you know the key to the problem?为什么用to不用for

Do you know the key to the problem?为什么用to不用for
key 和to 是固定搭配

固定用法吧,the key to sth
the key to doing sth

the key to the problem是固定的

key to
answer to这些都是固定搭配

门的钥匙,问题的答案,都用to