-- your homework yet?-- Not yet. I it.A. Have you done; am doingB. Did you do; am doingC

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。