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________is known to all is that china has a larger populatio

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________is known to all is that china has a larger population than any other country
A that B what C it D AS
为什么 为什么不能选C 与D?
As is known to all,China has a larger population than any other country.(非限制性定语从句)
It is known to all that China has a larger population than any other country.(主语从句,it作形式主语)
What is known to all is that china has a larger population than any other country .(what引导的主语从句)
你比较一下这三个句子,就知道怎么选了.