______ 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、Who
B、Which
C、As
D、It

答案C

解析 关系词as和which均可引导非限制性定语从句,修饰整个主句。但是as引导的定语从句可置于句首,也可置于句中,而which引导的定语从句只能后置。本题正确答案为C。
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