◎ 题干
He finished middle school        .
A.in twenty in 1950sB.at twenty in the 1950s
C.in twenties in the 1950sD.at twenties in the 1950s
◎ 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“He finished middle school.A.in twenty in 1950sB.at twenty in the 1950sC.in twenties in the 1950sD.at twenties in the 1950s…”主要考查了你对  【序数词】【小数】【分数】【量词】  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。