I don’t think it _can__ be __he__ .why?为什么可以用he?

I don’t think it _can__ be __he__ .why?为什么可以用he?
I don’t think it _can__ be __he__ .why?为什么可以用he?

I don’t think it _can__ be __he__ .why?为什么可以用he?
I don’t think it _can__ be __he__ .其中It做I don't think 的宾语,而(that) can be he 是it 的同位语从句.