Mary邀请你周六去参加她的生日聚会,但是那天你很忙.请写一封信给她,向她示感谢,说明你有什么事要做

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  • Dear Mary,Thank you for your invitation.I am so happy.First,happy birthday to you.Second,this Saturday,I am going to go my teacher's home to study,and I'm afraid I have no time to go your home to take part in your birthday party.I am so sorry to do it.Best wishes to you!Yours,XXX