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(gè)性中起真正作用，這一點(diǎn)（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(yǔ)結(jié)構(gòu)（matters用了動(dòng)詞的三單形式），說(shuō)明是一個(gè)句子；從句中matters缺少主語(yǔ)，要用連接代詞．故選D．

點(diǎn)評(píng) 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?cè)诰渲械恼Z(yǔ)法作用，這類從句又可分為主語(yǔ)從句、同位語(yǔ)從句、表語(yǔ)從句和賓語(yǔ)從句． 本題中it充當(dāng)形式主語(yǔ)，真正的主語(yǔ)是后面what引導(dǎo)的主語(yǔ)從句．

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