______is known to the world, Mark Twin is a great American writer.

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问题 ______is known to the world, Mark Twin is a great American writer.

选项 A、Which
B、As
C、That
D、It

答案B

解析 as在用来指代整个一句话、引导非限制性的定语从句时,既可指代前面说过的也可指代后面将要说到的;which在引导此类从句时,只能指代前面说过的。如:As might be expected,the response to file question was very mixed. (也可说:The response to the question was very mixed,as might be expected,)New Concept English is intended for foreign students,which is known to all of us. (不能说:Which is known to all of us,New Concept English is intended for foreign students.)
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