it is possible to do sth和it possible to do sth谁是正确的

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it is possible to do sth和it possible to do sth谁是正确的

这是it的两个不同用法,it is possible to do 是it做形式主语,例如It is possible to answer the question.而it possible to do 是it做形式宾语的用法,例如Do you think it possible to work out this problem.