题目内容

— Could you please do some shopping for me, Mary?
— Sorry, I ______ my homework.         
A．doB．am doingC．have doneD．was doing
B
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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