Question

-- ________  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

Answer 1

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。