I was really too busy with my homework and I couldn't help housework.A. doingB. doC. did

问题补充：

I was really too busy with my homework and I couldn help housework.

A. doing

B. do

C. did

D. done

答案：

A. doing

(答案→)B. do

C. did

D. done

解析：此题有一定难度和迷惑性。can help doing是我们熟知的用法，表示“禁不住”。但是本题中can help表示“不能帮助做”。