Question

The earth travels round the earth once every moth;  ____ is known to everybody.

A．as

B．it

C．which

D．this

Answer 1

A

考查非限制性定语从句，as引导非限制性定语从句，修饰前面的句子，意为‘正如”,句意是：正如大家都知道的，地球每个月自转一圈。选A。