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    精英家教网 > 初中英语 > 题目详情
    The abacus _____ invented in the sixth century by Chinese people.

    A. be
    B. is
    C. was
    D. were
    C
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    科目：初中英语 来源：同步题 题型：单选题

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

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