A.They were looked down upon by European immigrants.B.They had a hard time seeking equ

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A.They were looked down upon by European immigrants.

B.They had a hard time seeking equal job opportunities.

C.They worked very hard to earn a decent living.

D.They strongly opposed continued immigration.

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