Before becoming a performer Gaga had done the following jobs EXCEPTA.a waitress.B.a barte

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Before becoming a performer, Gaga had done the following jobs EXCEPT

A.a waitress.

B.a bartender.

C.a dancer.

D.a band player.

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