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There are some questions___which have no definite answers.为什

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There are some questions___which have no definite answers.为什么填to?
先行词question在从句中当什么成分?
There are some questions___which have no definite answers.为什
首先questions后面有个定语从句,定语从句的先行词questions在定语从句是不做成分的.
to是个介词,在这里前置了,是answers to the questions,所以用to