◎ 题干
— What ______ when the earthquake (地震) happened on May 12th?
— Er, I was having a geography class in the classroom.

[     ]

A. are you doing
B. did you do
C. were you 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“— What ______ when the earthquake (地震) happened on May 12th? — Er, I was having a geography class in the classroom. [ ]A. are you doing B. did you doC. we…”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。