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—What ______ when the earthquake 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  D will you do
C

试题分析:考查时态。过去进行时表示在过去的某个时间点或者时间段正在发生的事情。句意:当5.12地震发生的时候,你在做什么?—嗯,我在真正教室里上地理课。故C正确。
点评:过去进行时表示在过去的某个时间点或者时间段正在发生的事情。
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