Whilereading,anideastruckme_______

发布时间：2020-07-09 19:26:25

While reading, an idea struck me _________ books are the greatest invention of human beings．













A.what












B.which











C.whose











D.that

网友回答

D解析that books are the greatest inventions of human beings是idea的同位语表示其内容。
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