I'm glad to know that you had an interest in Chinese food.Here I'd like to tell you something about你们说about后是加it还是加them呢?我觉得加them 貌似也没什么错的啊?

I'm glad to know that you had an interest in Chinese food.Here I'd like to tell you something about你们说about后是加it还是加them呢?我觉得加them 貌似也没什么错的啊?
I'm glad to know that you had an interest in Chinese food.Here I'd like to tell you something about
你们说about后是加it还是加them呢?我觉得加them 貌似也没什么错的啊?

I'm glad to know that you had an interest in Chinese food.Here I'd like to tell you something about你们说about后是加it还是加them呢?我觉得加them 貌似也没什么错的啊?
如果是it,指代的就是 you had an interest in Chinese food这件事,如果是them,指代就是chinese food