问题补充:
is known to everybody, the moon travels around the earth once a month. .
A. It
B. As
C. That
D. What
答案:
A. It
(答案→)B. As
C. That
D. What
解析: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。
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