________ is known to everybody，the moon ...

________ is known to everybody，the moon travels around the earth once every month.

A．It B．As

C．That D．What

【解析】B 解析本题考查as引导的非限制性定语从句。as作“正如……”解时，引导的非限制性定语从句来修饰整个句子，可前指或后指，此处为后指。当as在从句中作主语时，常用于下列短语：as is known，as is said，as is reported，as is announced等。

考点分析：

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