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    The personal computer _____ in 1976.  It has changed the whole world.

    A. has been invented
    B. is invented
    C. was invented
    D. invented
    C
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    科目：初中英语 来源：同步题 题型：单选题

    The personal computer _____ in 1976.  It has changed the whole world.
    [     ]
    A. has been invented
    B. is invented
    C. was invented
    D. invented

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