题目内容：
______is known to the world, Mark Twainis a great American writer.
A.That
B.Which
C.As
D.It
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：
选择题：______is known to the world, Mark Twainis a great American writer.
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- 题目类型：选择题
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