老师好,they代词的单复数形式上不一定是对应的:
https://www.moving.com/tips/what-you-need-to-know-when-moving-to-london/
这个网站的句子:You’re going to need to set aside about three months to acquire a U.K. work visa, but there’s never a guarantee that you’ll succeed in getting one and they’re not cheap to apply for.
they前面没有形式上是复数的名词,不过语义上倒讲得通,这样是合适的吗?