Question

i think ? best to follow these school rules.

?处，怎么填？
A.we are B.you are C.i'm D.it's
原因。。谢谢！

Answer 1

D 指代一件事

Answer 2

i think it's best to follow these school rules。
我认为最好遵守这些学校规则。

从句 it's best to follow these school rules中，
it 代替后面的动词不定式to follow these school rules， it是形式主语，动词不定式是句子的主语，
在英语中，动词不定式作主语时常用it来代替，构成句式：
It's +adj+to do 这一句型

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Answer 3

D 用代词it指代后面的真正的主语to follow these school rules， it在这里起到了形式主语（就是挂牌的，冒牌货的主语）的作用

Answer 4

选D it's
我想最好遵守学校的制度。