◎ 题干

220. Mr. Wang was reading ______ on how to learn a foreign language when someone came to see him.
A.paperB.a piece of paper C.a paperD.a sheet of paper
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“220. Mr. Wang was reading ______ on how to learn a foreign language when someone came to see him.A.paperB.a piece of paperC.a paperD.a sheet of paper…”主要考查了你对  【可数名词及其单复数】【集合名词】【名词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。