问题补充：
-- 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
答案：
(答案→)A. Have you done; am doing
B. Did you do; am doing
C. Have you done; did
D. Did you do; did
解析：句意：你完成作业了吗?还没有。我正在做。由yet可知该句用现在完成时态，结合情景知后句用现在进行时态。所以选A。
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