. _______C__ is known to all, paper was first made in China. A.That B.Which C.As D.I 求答案解析。

. _______C__ is known to all, paper was first made in China. A.That B.Which C.As D.I 求答案解析。

你好,这题的正确答案是C.
在这个句子中,AS引导的是一个非限制性定语从句,AS代替后面的整个句子.
句子的意思是:
众所周知,纸最先是要中国制造的,
此外,这个句子可变为以下重要的句子,请认真学习:
It is known to all that paper was first made in China.
在这个句子中,IT作形式主语,真正的主语是THAT引导的从句,
What is known to all is that paper was first made in China.
在这个句子中,WHAT引导的是一个主语从句,THAT引导的是一个表语从句,追问谢谢，
那请问除了用as来引导非限制性定语从句，还可以用什么词来引导？
是不是在非限制性定语从句中，代替句子的只能是as？追答不是的,还可以用WHICH,WHO ,如下面的句子:
Tom did well in the final exam, which made his parents very happy.
Yesterday I saw an old man ,who wore the old clothes.

C固定的 这里的AS是代词+连词

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