..is known to everybidy,the moon travels round the earth once every montha.itb.asc.thatd.what为什么?

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..is known to everybidy,the moon travels round the earth once every month
a.it
b.as
c.that
d.what
为什么?

B
As is known to ...做状语是一个固定用法 记住就行了,从语法上解释比较麻烦
如果后面有that的话,就用it's known to..构成强调句

A

答案:as
as is known to everybody,意思是众所周知...as指代后面那句话。在这里as指代the moon travels round the earth once every month。
整句意思是:众所周知每个月月亮围绕地球公转一圈。