◎ 题干
—Did you see the traffic accident yesterday?
—Yes, It happened when I ________ past the museum.
[     ]
A. walk
B. am walking
C. will walk
D. was walking
◎ 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“—Did you see the traffic accident yesterday? —Yes, It happened when I ________ past the museum. [ ]A. walk B. am walking C. will walk D. was walking …”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。