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  Paper________aboutathousandyearsagobyCaiLun.A.wasinventedB.isinventedC.inventedD.hasinvented

  Paper________aboutathousandyearsagobyCaiLun.

  A.wasinvented

  B.isinvented

  C.invented

  D.hasinvented

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2020-12-2704:48
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蔡晓

  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.

2020-12-27 04:51:32
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