_____ is known to everybody, the moon tr...

_____ is known to everybody, the moon travels round the earth once every month.

A．It

B．As

C．That

D．What

B 【解析】考察从句连词选择。根据句子结构可知，该句为非限制性定语从句，从句中缺少is的主语，代指后面的 the moon travels round the earth once every month

考点分析：

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