a ticket to the concert,a key to my room为什么后面用to?类似的短语还有哪些?

确实,这种题没什么为什么,做的多了自然就会了
the answer to this question
the entrance to the building
还有些动宾结构的
如 a pen to write with
a piece of paper to write on
a question to answer
有些单词后跟of
如 your way of speaking
the best way of solving the problem
但应该说:the best method to solve the problem