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    It is said that potato chips by mistake about a hundred years ago. 【查看更多】

     

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    It is said that potato chips ____________ by mistake about a hundred years ago.

         A. invent       B. invented     C. are invented      D. were invented

     

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    It is said that potato chips ____________ by mistake about a hundred years ago.
    A．inventB．inventedC．are inventedD．were invented

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    It is said that potato chips            by mistake about a hundred years ago.
    [     ]
    A. invent
    B. invented
    C. are invented
    D. were invented

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    It is said that potato chips ______ by mistake about a hundred years ago.

    [     ]

    A. invent
    B. invented
    C. are invented
    D. were invented

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    It is said that potato chips ________ by mistake about a hundred years ago．

    A．invent               B．invented           C．are invented           D．were invented

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