Paper________aboutathousandyearsagobyCaiLun.A.wasinventedB.isinventedC.inventedD.hasinvented
<p>问题：Paper________aboutathousandyearsagobyCaiLun.A.wasinventedB.isinventedC.inventedD.hasinvented<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">蔡晓的回答：<div class="content-b">网友采纳 答案A “木轮”与“发明”是被动关系,由athousandyearsago可判断出其为过去式wasinveted.
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