◎ 题干
Mary _____ her homework, but Mike did.  
[     ]
A. didn't do
B. doesn't do
C. will do
D. is doing
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Mary _____ her homework, but Mike did. [ ]A. didn't do B. doesn't do C. will do D. is doing…”主要考查了你对  【实义动词】【助动词】【一般过去时】  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。