group of+（数字）中group要加s吗?

group of+（数字）中group要加s吗? group of group: group one group of a group of用法 a group of our group agress with some of Group One's opinions什么意思 henry started to ___a group of people to a group people to s live in a family groups 为什么要group要加s We often work in groups in calss.为什么group要加s? A group of young people are g________ a fashion s