英语句子正误判断

请问，这句话错在哪儿？

Not until the 19th and 20th centuries did modern nationalism in Europe produced its ripest fruit and its lethal poisons.



Not until the 19th and 20th centuries did modern nationalism in Europe produced its ripest fruit and its lethal poisons.

否定开头的句子，句子倒装了，前面已经有did了，produced 就是错了，改为原形produce。

直到19世纪和20世纪，欧洲的现代民族主义才产生了最成熟的果实和致命的弊病。