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-- ________  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
A               
             
试题分析:考查动词时态。句意 你做完作业了吗?没有,我正在做。haven't done 强调还没有做这个概念, 而 am doing 是说马上要做,口语中常说的(这时现在进行时表将来的概念,例如I'm coming. I'm going to school),所以选A项。
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