问题描述：
高中英语同义句转换
More than ten years passed.Then someone else turned penicillin into the great drug of the 20th century
It was over a ＿ ＿ someone else turned penicillin into the great drug of the 20th century
More than ten years passed.Then someone else turned penicillin into the great drug of the 20th century
It was over a ＿ ＿ someone else turned penicillin into the great drug of the 20th century
问题解答：
我来补答展开全文阅读