the question is too hard to answer后力什么不加it?

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the question is too hard to answer后力什么不加it?

the question is too hard to answer后力什么不加it?
the question is too hard to answer后力什么不加it?

the question is too hard to answer后力什么不加it?
it 指代的是the question, 此句中不需要指代