______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 定语从句。as引导非限制性定语从句,指代整个主句内容,表达“正如”之意。
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