◎ 题干
-- ________  your homework yet?
-- Not yet. I _______ it.
A.Have you done; am doingB.Did you do; am doing
C.Have you done; didD.Did you do; did
◎ 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“ -- ________ your homework yet?-- Not yet. I _______ it.A.Have you done; am doingB.Did you do; am doingC.Have you done; didD.Did you do; did…”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。