恩,这两个答案都是可行的,但是句子结构就完全不同了
如果是用it,作形式主语
而用it's之后,后面就是一个宾语从句了
I think (that) it's necessary for students to make an interest in all subjects
it还是作后面宾语从句的形式主语
I think ___ (it) necessary for students to make an interest
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