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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 究竟是什么在決定孩子的性格和個性中起真正作用，這一點（現(xiàn)在）還不清楚．

解答 答案：D  題干所給的句子中，前面是It is still not quite clear 這件事還不清楚；后面接了on earth really matters in deciding a child's character and personality謂語結構（matters用了動詞的三單形式），說明是一個句子；從句中matters缺少主語，要用連接代詞．故選D．

點評 在句子中起名詞作用的各種從句統(tǒng)稱為名詞性從句．根據(jù)它們在句中的語法作用，這類從句又可分為主語從句、同位語從句、表語從句和賓語從句． 本題中it充當形式主語，真正的主語是后面what引導的主語從句．

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