2. 外语
  3. ______ is known to the world, Mark Twain is a great American writer.

______ is known to the world, Mark Twain is a great American writer.

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问题 ______ is known to the world, Mark Twain is a great American writer.
选项 A、That
B、Which
C、As
D、It
答案C
解析 关系代词as可引导非限制性定语从句，这时，as指代整个主句。既可放在主句前，也可放在主句后，后一种情况往往被看作是插入语，如：As is known to us all，contributions to computer technology are no longer confined to any one country．大家都知道，对计算机技术作出贡献的，已经不仅仅是某一个国家了。
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