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9.___________ is certain,though,is that the mystery of Stonehenge has never been fully explained and it still remains a puzzle.(  )
A.ItB.WhatC.WhichD.That

分析 不过确定的是巨石阵的秘密到现在为止从未被完全解释清楚,至今仍是谜.

解答 答案为B.本题考查名词性从句中引导词.题干中be 动词is前的主语从句中缺少引导主语从句的引导词,it不引导主语从句,排除A;主语从句中缺少主语,而that在名词性从句中不担任成分,所以排除D;名词性从句中which表示选择,本题中不含选择,排除C;名词性从句中,what在从句中可以充当主语,由此判断答案是B.

点评 名词性从句考查的关键是连接词的选用和语序,因此,我们首先要搞清从句的性质,掌握各连接词的用法,在此基础上判断.此外,关注名词性从句用陈述语序.

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