______is known to us all, the moon moves around the earth.

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问题 ______is known to us all, the moon moves around the earth.

选项 A、That
B、As
C、Which
D、It

答案B

解析 在as is known to all这一固定结构中,as引导的是非限制性定语从句,这一结构可以放在主句之前,也可以放在其后,意思为“众所周知”,所以确定B)为本题的答案。
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