◎ 题干
When I dropped in, Dr Smith _____, so we only had time for a few words.
A.just leftB.was just leaving
C.has just leftD.had just left
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“When I dropped in, Dr Smith _____, so we only had time for a few words.A.just leftB.was just leaving C.has just leftD.had just left…”主要考查了你对  【一般现在时】【过去进行时】【过去完成进行时】  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。