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题目内容
（国家开放大学理工英语）
________ is known to the world, Mark Twain is a great American writer.
单选题 (10 分) 10分
A.
As
B.
That
C.
Who
单选题 (10 分) 10分
A.
As
B.
That
C.
Who
参考答案
