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    12、________, the professor began the lecture.

    A．Seen that we had taken our seats         B．Having taken our seats

    C．When we took our seats                            D．Seating ourselves well

    12、C

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    ________, the professor began the lecture.

    A．Seen that we had taken our seats         B．Having taken our seats

    C．When we took our seats                            D．Seating ourselves well

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