none of them后跟复数；
以none of 开头的句子,谓语动词用单数或复数均可。none of.作主语,强调个体时,谓语动词用单数；若强调整体时,谓语动词则用复数。
Unfortunately, none of them succeeded.
不幸的是,他们都没有成功。
None of them could afford 50 for a ticket.
他们中没有哪个拿得出50英镑买一张票。
We have three sons but none of them lives/ live nearby.
我们有三个儿子，但他们都不住在附近。
