A.medical school studentsB.businesses and manufacturesC.political campaign participant

外语类 成人英语三级 已帮助 人

A.medical school students

B.businesses and manufactures

C.political campaign participants

D.actors, technicians and others

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗