◎ 题干
---I heard your grandpa used to be a teacher.
--- Yes. He was a math teacher ________.
A.on the 1950sB.in the 1950sC.at the 1950’sD.in 1950’s
◎ 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“---I heard your grandpa used to be a teacher. --- Yes. He was a math teacher ________.A.on the 1950sB.in the 1950sC.at the 1950’sD.in 1950’s…”主要考查了你对  【介词短语】【介词】  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。