◎ 题干
-What was Susan doing at 8 last night?
-She __________ her homework at 8 last night.
A. is doing   
B. was doing   
C. did
D  is  did
◎ 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 Susan doing at 8 last night?-She __________ her homework at 8 last night.A. is doingB. was doingC. didD is did…”主要考查了你对  【一般现在时】【过去进行时】【过去完成进行时】  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。