is known to everybody, the moon travels round the earth once every month. A. It
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_________is known to everybody, the moon travels round the earth once every month.
A. ItB. As
C. That D. What
试题答案
答案：B
提示：| 本题前半句是一个非限制性定语从句,在所给的四个选项中只有as能引导非限制性的定语从句,as代替整个主句所表达的内容,在从句中做主语,.故本题的答案是B.
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