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is known to everybody, the moon travels round the earth once every month. [ ] A.

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is known to everybody, the moon travels round the earth once every month. [ ] A.

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

[]

A.It

B.As

C.That

D.What

试题答案

答案:B

提示:

从第二句话可知,如果the moon前面有that的话,有可能是that引导主语从句,那么空格处就是it作形式主语,代替that引导的主语从句,反之,填as引导非限制性定语从句。