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    31． Personal computers in 1976． It has changed the whole world． A． are invented B． invented C． were invented D． have been invented 【查看更多】

     

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    Personal computers        in 1976．It has changed the whole world．

    A． are invented                    B． invented     

    C． were invented                   D． have been invented

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    Personal computers ________ in 1976．It has changed the whole world．

    [　　]

    A．have been invented

    B．was invented

    C．were invented

    D．are invented

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    Personal computers ________ in 1976．It has changed the whole world．

    [　　]

    A．have been invented

    B．are invented

    C．were invented

    D．invented

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    Personal computers ________ in 1976．It has changed the whole world．

    [　　]

    A．have been invented

    B．are invented

    C．were invented

    D．invented

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    Personal computers ________ in 1976. It has changed the whole world.

    [　　]

    A．have been invented

    B．are invented

    C．were invented

    D．invented

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