◎ 题干
—What was wrong with you yesterday evening?
—I ________ my homework when the light went off suddenly.
[     ]
A. doing
B. was doing
C. did
D. have done
◎ 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“—What was wrong with you yesterday evening? —I ________ my homework when the light went off suddenly. [ ]A. doing B. was doingC. did D. have done …”主要考查了你对  【过去进行时】  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。