______is known to all, the earth moves around the sun once a year.

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问题 ______is known to all, the earth moves around the sun once a year.

选项 A、That
B、As
C、What
D、It

答案B

解析 考查的是as引导的非限制性定语从句,as指代后面的整个句子。句意:正如大家所知道的,地球一年绕太阳转一圈。这种表达方式已经相对固定了,如果此处填it,这句话应该这样表达:It is known to all that the earth moves around the sun once a year.That the carth moves around the sun once a year是主语从句后置,it只是个形式主语。选项that不能引导非限制性定语从句,what不能引导定语从句。
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