—Shall we go out for a walk?—Sorry I can’t. I my homework.A. doB. didC. am doingD. was d

问题补充：

—Shall we go out for a walk?

—Sorry, I can’t. I my homework.

A. do

B. did

C. am doing

D. was doing

答案：

A. do

B. did

(答案→)C. am doing

D. was doing

解析：考查情景交际。“我们出去散步好吗？”“对不起，我不能。我正在写作业呢。”说话时正在进行的动作，用现在进行时。故选C。