Who is the speaker?A.A doctor.B.A nurse.C.A professor.D.A student.

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Who is the speaker?

A.A doctor.

B.A nurse.

C.A professor.

D.A student.

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