Someone is in the classroom.Who is-- A he B it C they理由

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Someone is in the classroom.Who is-- A he B it C they理由

Someone is in the classroom.Who is-- A he B it C they理由
Someone is in the classroom.Who is-- A he B it C they
理由

Someone is in the classroom.Who is-- A he B it C they理由
B.
由于没有明确说明是什么东西.
所以用it指代.