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    19、The television is without doubt one of the greatest technological wonders that __________ by mankind so far.

    A．have been created                             B．has been created

    C．was created                                     D．were created

    19、A

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    The television is without doubt one of the greatest technological wonders that __________ by mankind so far.

    A．have been created                             B．has been created

    C．was created                                     D．were created

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