感谢信开头段常用句式

　　i would like to convey in this letter my heartfelt thanks to you for...

　　i am writing to extend my sincere gratitude for... i am writing to express my thanks for...

　　i feel deeply indebted to you and i really don't know how to thank you enough for your help.

　　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.

        i am writing to show my sincere appreciation for...

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