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-- ________ your homework yet?
-- Not yet. I _______ it.

A．Have you done; am doing	B．Did you do; am doing
C．Have you done; did	D．Did you do; did

試題分析：考查動詞時態。句意你做完作業了嗎？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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