前面是it做形式主语,真正的主语是后面的不定式.而后面实际是一个表语从句,what引导一个主语从句,在主语从句中what又作句中的主语,把what引导的主语从句看作一个整体,实际上是一个主语,相当于单数,故用单数.
It’s known to all that.改成what is known to all is that 中为什么要加
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