◎ 题干
-Have you seen Mr. Black these days, Jack?
-Yes, I met him when I ________ in the street yesterday.
A.walkedB.was walkingC.have walkedD.is walking
◎ 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“-Have you seen Mr. Black these days, Jack?-Yes, I met him when I ________ in the street yesterday.A.walkedB.was walkingC.have walkedD.is walking…”主要考查了你对  【不定式】【分词】【动名词】  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。