◎ 题干
— I can't believe it! I only got a B on my project.
— That's not a bad grade.
— But I _____ on it for weeks.
[     ]
A. am working
B. have worked
C. work
D. worked
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—I can't believe it! I only got a B on my project. — That's not a bad grade. — But I_____ on it for weeks. [ ]A. am working B. have worked C. work D. wo…”主要考查了你对  【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。