_______,the compass was first made in China.A.It is known to all B.We all know C.As is known to allD.Itis known that

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_______,the compass was first made in China.A.It is known to all B.We all know C.As is known to allD.Itis known that
_______,the compass was first made in China.
A.It is known to all B.We all know C.As is known to allD.Itis known that

_______,the compass was first made in China.A.It is known to all B.We all know C.As is known to allD.Itis known that
C 理由:As is known to all,是一个定语从句,后接“逗号”,再接主句.如果选A,应为:It is known to all that.,即用it 时,两句中间不能是逗号,应是that; B We all know后不接逗号,应接that(宾语从句);What is known to all后接is that.故选C.

个人认为选第1个。

C.As is known to all

C

答案是 C.As is known to all 这是as引导的非限制性定语从句 as是关系代词 代替后面要表达的句子 并在从句中作主语

C.As is known to all 固定搭配,"众所周知"
其实as引导定从,as指代后面整个句子,
如用It is known to all , 全句应为: It is known to all that the compass was first made in China.
也就是说: it 作形主, that 从句作真正的主语.