Unfortunately, when I dropped in, Professor Smith ________, so we only had time for a few words.
A．has just left
B．had just left
C．just left
D．was just leaving
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◎ 知识点
根据n多题专家分析，试题“Unfortunately, when I dropped in, Professor Smith ________, so we only had time for a few words. A．has just leftB．had just leftC．just leftD．was just leaving…”主要考查了你对 【一般现在时】，【将来进行时】，【过去完成进行时】，【过去将来时的被动语态】 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。
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