选择并解释A group of us ___have/has decided to hire a boat

关于a group of a group of 的用法。。。。 controlling group of a number of companies In fact, a group of researchers say .... in front of a group中文意思 a group of 和 a crowd of 有什么区别 A group of children 用单数还是复数? the visitor came in,___by a group of young men. 请选择 ，并解释 There is _____milk in the bottle.A a lot of B lots of选择哪个并说原因，谢谢！