_______ is known to everybody, the moon ...

_______ is known to everybody, the moon travels around the earth once a month. .

A．It

B．As

C．That

D．What

B 【解析】试题分析：考查定语从句。As指代后面一句话的内容，引导非限制性定语从句，在本句总做主语。句意：正如每个人都知道的那样，月球一个月绕着地球一圈。故B正确。考点：考查定语从句

考点分析：

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