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    --When the abacus ? -- In the sixth century by the Chinese people. A. is, invented B. did, invent C. was, invented D. does, invent 【查看更多】

     

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    --When _____ the abacus _____?   -- In the sixth century by the Chinese people.

    A．is, invented

    B．did, invent

    C．was, invented

    D．does, invent

     

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