A.For a marine exhibition.B.For a marine biology class.C.For a scuba diving class.D.Fo

外语类 职称英语 已帮助 人

A.For a marine exhibition.

B.For a marine biology class.

C.For a scuba diving class.

D.For a special treasure hunting trip.

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