___no knowledge whatmay happen in one hundred years"timeA It isB This is CThere isD That"s 选哪个 为什么 考点是啥

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___no knowledge whatmay happen in one hundred years

___no knowledge whatmay happen in one hundred years"timeA It isB This is CThere isD That"s 选哪个 为什么 考点是啥
___no knowledge whatmay happen in one hundred years"time
A It is
B This is
CThere is
D That"s 选哪个 为什么 考点是啥

___no knowledge whatmay happen in one hundred years"timeA It isB This is CThere isD That"s 选哪个 为什么 考点是啥
A 这是主语从句
格式就是:it's 引导
为了防止句子头重脚轻,通常把形式主语it放在主语位置,真正主语搁置于句末
再给你一个例句:
It is still a mystery what caused the accident.

选A It is,It是形式主语,为了防止句子头重脚轻