4．Science and technology are advancing so quickly that _______ is a possibility today may be a reality tomorrow．（　�。�
A．thatB．whichC．不填D．what

分析 科技發(fā)展這么快，今天不可能的事也許明天就能成為現(xiàn)實(shí)．

解答 答案：D
題干中so…that…引導(dǎo)結(jié)果狀語從句；從句中is a possibility today位于may be的前面，是作系動(dòng)詞的主語，是一個(gè)主語從句；主語從句中沒有主語，要用連接代詞；which在名詞性從句中表示有范圍的選擇，句意表達(dá)的是抽象的事物．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what在主語從句中起連接作用，同時(shí)又充當(dāng)了從句的主語．

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