南京赛莱默水泵官网:高中英语问题 16.14

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高中英语问题
请告诉我一下原因,谢谢
as is known to all
it is known to all
区别是什么

表"众所周知"时,It is known to all后应接that从句,As is known to all后应用逗号。

举两个例子吧
As is known to all,the moon is around the earth.

It is known to all that the moon is around the earth.