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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 【查看更多】

     

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    — 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

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    －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

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