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”。
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