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the question is too diffictllt for me to___.答案为answer ,为何不用a

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the question is too diffictllt for me to___.答案为answer ,为何不用answer it?
同样,i need a room to live in.此处却要加个in,为何不表述为i need a room to live.
the question is too diffictllt for me to___.答案为answer ,为何不用a
很简单
to live in a room  不是 to live a room
to answer a question, 不是 to answer a question it
你举的例子中,question 和 room 叫做 antecedant, 也就是说是后面动词和介词的宾语.
再举两个例子:
i need someone to love = i need to love someone
i need someone to love me = i need to be loved by someone