A.Courses for doctors.B.Courses for businessmen.C.Courses for reporters.D.Courses for

外语类 英语考试 已帮助 人

A.Courses for doctors.

B.Courses for businessmen.

C.Courses for reporters.

D.Courses for lawyers.

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