is known to the world, Mark Twain is a great American writer.A、ThatB、It

游客2023-09-25 22

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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______isknowntotheworld,MarkTwainisagreatAmericanwriter.A、AsB、That