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    21、He could have helped us, but he ___ from coming in time by a traffic jam.

    A．has been prevented      B．had been prevented                             

    C．is prevented           D．was prevented

    21、D

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    He could have helped us, but he ___ from coming in time by a traffic jam.

    A．has been prevented      B．had been prevented                             

    C．is prevented           D．was prevented

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