A.Taking a photo.B.Going through customs.C.Having a physical exam.D.Conducting an intervie

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A.Taking a photo.

B.Going through customs.

C.Having a physical exam.

D.Conducting an interview.

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