来自沈蔚杰的问题
Paper________aboutathousandyearsagobyCaiLun.A.wasinventedB.isinventedC.inventedD.hasinvented
Paper________aboutathousandyearsagobyCaiLun.
A.wasinvented
B.isinvented
C.invented
D.hasinvented


Paper________aboutathousandyearsagobyCaiLun.A.wasinventedB.isinventedC.inventedD.hasinvented
Paper________aboutathousandyearsagobyCaiLun.
A.wasinvented
B.isinvented
C.invented
D.hasinvented
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.