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    The abacus was invented by Chinese people. A. in the sixth Century B. in the sixtieth Century C. in the sixteenth Century D. in the six Century 【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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    The abacus _____ invented in the sixth century by Chinese people.
    [     ]
    A. be
    B. is
    C. was
    D. were

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