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_____ is certain is ______ the mystery of Stonehenge has never been fully explained.
A.It, thatB.What, what
C.It, whatD.What, that
D

试题分析:考查名词性从句。本题第一空what引导的是主语从句what is certain,在句中做主语。第二空that引导的是表语从句,that在表语从句中不充当任何成分,只起引导的作用。句意:确定的事情是巨石阵的秘密到现在为止还没有被完全解释。故D正确。故D正确。
点评:名词性从句的考查集中在引导词的选择上,连接词that, whether, if在句中不充当任何成分,只起连接作用;连接代词who(ever), which(ever), whom(ever),whose(ever),what(ever)在句中做主语,宾语,表语和定语;连接副词when, why, where, how,在句中做状语。应从上下句的句法关系着手分析,切不可‘望句形生答案’总的来说,考生在解答此类型时,可用排除法或造句法,造句法就是仿造原句的语法功能仿造出一个易懂易理解的句子,帮助判断。
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