Neither/nor and either/or are a special case.If two subjects are
joined by or or nor,the verb should agree with the subject that is
closer to it.
谓语跟最近的主语.最近的主语是单数,谓语就是单数;最近主语是复数,谓语就是复数.
例:Neither they nor I was the winner.
Neither I nor they were the winners.
Neither they nor he has a cat.
Neither he nor they have a cat.