is known to everybody that the moon travels round the earth once every month.A. It B. AsC

发布时间：2020-08-17 12:45:25

     is known to everybody that the moon travels round the earth once every month.
A. It
B. As
C. That
D. What

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(答案→)A. It
B. As
C. That
D. What
解析：it 为形式主语，真正的主语是后面的 that 从句。
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