A set of ,a group of ,a serious of 后A set of ,a group of ,a serious of 后面的动词单复数和谓语动词的单复数的情况都是哪些?如果是一系列的茶具,那么应该用哪个?

a group of A group of scientists _____ the west of the country.A.have set off B.have set out for C.have set off for C,set out a set of a set of They set up a group（ ）（作战）against the destruction of thrainforests. a group of man 还是a group of men 为什么？ a group of enemies or ,a group of enemy 用a group of 造句. a group of 中文意思 a group of classmates是什么意思 A group of young birds! a group of 怎么用 a complex set of 具体 complex set a set of是什么意思啊? set a record of造句 a set of译成英语 a set of ____(key). A set of ,a group of ,a serious of 后A set of ,a group of ,a serious of 后面的动词单复数和谓语动词的单复数的情况都是哪些?如果是一系列的茶具,那么应该用哪个?