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、It
C、Which
D、As

答案D

解析 As引导非限制性定语从句，指代后面整个主句，在定语从句中作主语。

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大学英语三级A级

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