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  weallknowthatpaper(.)bychinesepeopleintheolddaysA.wasinventedB.areinventedC.Isinvited

  weallknowthatpaper(.)bychinesepeoplein

  theolddaysA.wasinventedB.areinventedC.Isinvited

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2020-06-1310:51
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  A.wasinvented过去式,被动语态

2020-06-13 10:54:47
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