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

______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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