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______is known to us all is that the 2008 olympic Games will take place in Beijing.
A,It     B,What    C,As    D,Which
B

试题分析:通过分析句子结构,可知这是一个复合句,其中包含一个主语从句,且引导词在从句中作主语,故用What。
点评:在句子中起名词作用的句子叫名词性从句 (Noun Clauses)。名词性从句的功能相当于名词词组,它在复合句中能担任主语、宾语、表语、同位语、介词宾语等,因此根据它在句中不同的语法功能,名词性从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。解答这类题目,关键在于分析清楚句子结构。通过判断引导词在从句中所作的成分及意义,来选择正确的引导词。
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