A.Rich people are not happy.B.Being rich is the best thing in the world.C.Being rich i

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A.Rich people are not happy.

B.Being rich is the best thing in the world.

C.Being rich is not always a good thing.

D.Rich people are usually with their families.

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