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

     

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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               C. 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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