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    33． halfway through the exercise, the teacher changed his mind and collected all our papers． A． When only being B． When we were only C． Being only D． Having been 【查看更多】

     

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    ______ halfway through the exercise, the teacher changed his mind and collected all our papers．

    A．When only being                           B．When we were only

    C．Being only                             D．Having been

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