A HUNDRED YEARS AGO这个表达对吗?

A HUNDRED YEARS AGO这个表达对吗? a few hundred years ago What seemed impossible a hundred years ago? more than a hundred years ago=more than one hundred years ag Electric toothbeushes seemd impossible a hundred years ago. over a hundred years ago 中over是什么词性? The magnificent museum is said ___about a hundred years ago. The hundred years ago there was a bird called dodo Our Longmen Building was built about a hundred years ago. About two thousand five hundred years ago a Greek historian a hundred pounds worth 这个句子对吗? a hundred years