______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 as作关系代词，指代整个主句“Mark Twain is a great American writer．”。它引导的非限制性定语从句，既可放在主句前，也可放在主句后。which引导的定语从句必须放在主句后面，故排除B。也可以用it is known to the world that…句型，只需对原句加以修改，去逗号，添that。

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本试题收录于： A类竞赛（研究生）题库大学生英语竞赛（NECCS）分类