◎ 题干

________ Pierre began to help his father with the farm work when he was        
A.In 1980’s; his teensB.At the 1980’s; the teens
C.In the 1980s; in his teensD.In 1980’s; in the teens
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“________ Pierre began to help his father with the farm work when he was A.In 1980’s; his teensB.At the 1980’s; the teensC.In the 1980s; in his teensD.In 198…”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。