◎ 题干
—Shall we go out for a walk?
—Sorry, I can't. I _____ my  homework.
[     ]
A. do    
B. did    
C. am doing
D. was doing
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—Shall we go out for a walk?—Sorry, I can't. I _____ myhomework.[ ]A. doB. didC. am doing D. was doing…”主要考查了你对  【现在进行时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。