问题补充:
— Could you please do some shopping for me, Mary?
— Sorry, I my homework.
A. do
B. am doing
C. have done
D. was doing
答案:
A. do
(答案→)B. am doing
C. have done
D. was doing
解析:当别人请你做某事的时候,我们表示拒绝,应该是正在做或将要做别的事,可用进行时态的结构来表示,故本题选B。意思为我正在做作业。
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