As is known to all,the moon travels around the earth once every month.

As is known to all,the moon travels around the earth once every month.

题目
As is known to all,the moon travels around the earth once every month.
这里的as能换成it吗?
it做形式主语加that,
答案
As is known to all是习惯用语,众所周知的意思,写成it is known to all that语法上说的过去,但显得没有用as地道.
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