Booksaremade_________paperwhilepap

发布时间：2020-07-25 18:57:31

Books are made _________ paper while paper is mainly made _________ wood．A.of; ofB.from; fromC.of; fromD.from; of

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C解析能看出原材料用be made of；不能看出原材料用be made from，故
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