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    How did the group improve its discussion? “They all took part, each member the responsibility of leading one meeting. A has B having C has had D to have 【查看更多】

     

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    —How did the group improve its discussion?

    —They all took part, each member ________ the responsibility of leading one meeting.

    [　　]

    A．has
    B．having
    C．has had
    D．to have

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