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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               
             
試題分析：考查動詞時態(tài)。句意 你做完作業(yè)了嗎？沒有，我正在做。haven't done 強調還沒有做這個概念， 而 am doing 是說馬上要做，口語中常說的（這時現(xiàn)在進行時表將來的概念，例如I'm coming. I'm going to school），所以選A項。
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