题目内容

18.It is still not quite clear ________ on earth really matters in deciding a child's character and personality.(  )
A.whenB.whereC.howD.what

分析 究竟是什么在决定孩子的性格和个性中起真正作用,这一点(现在)还不清楚.

解答 答案:D  题干所给的句子中,前面是It is still not quite clear 这件事还不清楚;后面接了on earth really matters in deciding a child's character and personality谓语结构(matters用了动词的三单形式),说明是一个句子;从句中matters缺少主语,要用连接代词.故选D.

点评 在句子中起名词作用的各种从句统称为名词性从句.根据它们在句中的语法作用,这类从句又可分为主语从句、同位语从句、表语从句和宾语从句. 本题中it充当形式主语,真正的主语是后面what引导的主语从句.

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