we all know that paper (.) by chinese people inthe old days A.was invented B.are invented C.Is invited

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weallknowthatpaper(.)bychinesepeopleintheolddaysA.wasinventedB.areinventedC.Isinvitedweallknowthatpa

we all know that paper (.) by chinese people inthe old days A.was invented B.are invented C.Is invited
we all know that paper (.) by chinese people in
the old days A.was invented B.are invented C.Is invited

we all know that paper (.) by chinese people inthe old days A.was invented B.are invented C.Is invited
A.was invented 过去式,被动语态

A was invented