Speaker A: Good morning Lily! Speaker B: ______A.Good morning teacher!B.Good morning Te

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Speaker A: Good morning, Lily! Speaker B: ______

A.Good morning, teacher!

B.Good morning, Teacher Wilson!

C.Good morning, Dr. Wilson!

D.Good morning, Professor John Wilson!

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