尔雅 智慧树 mooc

Whichconversationismoreformal?AaHithere.Howarethings，man?bFine，thanks.BaHey，how’sitgoing?bOh，nottoobad，thanks.CaGoodmorning.Howareyou?bI’mverywell，thankyou.Andyou?

  尔雅 智慧树 mooc


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