◎ 题干
---I hear Sam has gone to Qingdao for a holiday.
---Oh, how nice! Do you know when he________?
A.was leavingB.has left
C.leftD.leaves
◎ 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 hear Sam has gone to Qingdao for a holiday.---Oh, how nice! Do you know when he________?A.was leavingB.has leftC.leftD.leaves…”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。