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英文书写表DearIhopethisletterfindsyouwell.IamwritingtoinformyouthatIwillnotbeabletoattendthepartyonFridayasIhaveapriorengagement.Iapologizeforanyinconveniencethismaycause.Iwouldalsoliketotakethisopportunitytoexpressmygratitudeforinvitingmetotheparty.Itrulyappreciateyourthoughtfulnessandkindness.PleaseextendmybestwishestoeveryoneattendingandtellthemIamsorryformyabsence.Iwilldefinitelymakeituptoyouandhopetoseeyousoon.Thankyouagainforincludingmeinyourcelebration.Warmestregards[YourName]第PAGE页共NUMPAGES页。