有关如何急救的英语写作课ppt

I am writing to extend my sincere gratitude for... I am writing to express my thanks for... I am writing to show my sincere appreciation for... I would like to convey in this letter my heartfelt thanks to you for... I feel deeply indebted to you and I really don't know how to thank you enough for your help. 感谢信结尾段常用句式和套话 I must thank you again for your generous help. I am most grateful for your selfless donation. My true gratitude is beyond the word's description. I feel most obliged to thank you once more. Please accept my gratitude, now and always.