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    精英家教网 > 初中英语 > 题目详情
    --When _____ the abacus _____?   -- In the sixth century by the Chinese people.
    A．is, inventedB．did, inventC．was, inventedD．does, invent
    C

    此题考查的是被动语态，由be+过去分词。算盘是人发明的，它是动作的承受者。发明在过去，故用was invented,选C。
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