..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 montha.itb.asc.thatd.what为什么?

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

..is known to everybidy,the moon travels round the earth once every montha.itb.asc.thatd.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。