◎ 题干
People in China used to keep records by putting a number of stones together, ___?
A.usedn’t they to B.did they C.used to they D.didn’t they
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“People in China used to keep records by putting a number of stones together, ___?A.usedn’t they toB.did theyC.used to theyD.didn’t they…”主要考查了你对  【一般疑问句】【特殊疑问句】【反意疑问句】  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。