—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
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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
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