◎ 题干
—Can you tell me if Tom has finished his homework?
—I've no idea. He ________ it this morning.
A.has being doing B.had done
C.is doing D.was doing
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“—Can you tell me if Tom has finished his homework?—I've no idea. He ________ it this morning.A.has being doingB.had doneC.is doingD.was doing…”主要考查了你对  【过去进行时】【过去进行时的被动语态】  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。