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

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问题 ______is known to everybody, the moon travels round the earth once every month.

选项 A、It
B、As
C、That
D、What

答案B

解析 由as引导的定语从句,可以放在主句前或后。as表示主句的内容,而不是代表某个先行词,故译成中文是“大家都知道的”。所以选B。
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