thirtieththirtythirty'sthirties的区别Theheroofthestoryisanartistinhis----AthirtiethBthirtyCthirty'sDthirties

Question

thirtieth thirty thirty's thirties 的区别
The hero of the story is an artist in his ----A thirtieth B thirty C thirty's D thirties

Answer 1

Dthirtieth是第三十的意思,序数词；thirty是30的意思,基数词；thirty‘s一般没有；in one’s thirties 为固定搭配,意为“在某人30多岁的时候”