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    9．-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, inventedB．did, inventC．was, inventedD．does, invent

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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

     

    查看答案和解析>>


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