26.(),paper was first made in China.a.It is known to allb.As is known to all选什么,怎么分析的?

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26.(),paper was first made in China.
a.It is known to all
b.As is known to all
选什么,怎么分析的?

选B啊!明显是个定语从句嘛!
As是定语从句部分的主语,代表主句部分.

选B
这里as把逗号后面的句子引代了
如果这里的逗号去掉,加个that
就只能选A了

B
根据句意和选项,前面部分应为非限制性定语从句,而引导非限制性定语从句的可以为as或者which,但which引导时不放在句首,故选as。

B
As is known to all...固定搭配
像所有人都知道的那样