A.Farm workers.B.White-collar workers.C.Blue-collar workers.D.Not mentioned.

外语类 职称英语 已帮助 人

A.Farm workers.

B.White-collar workers.

C.Blue-collar workers.

D.Not mentioned.

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