Dear______,
I am writing to extend my sincere gratitude for __________________(表扬的原因). If it had not been for your assistance in __________________(对方给你的具体帮助), I fear that I would have been___________________(没有对方帮助时的后果).
Every one agrees that it was you who___________________________(给出细节).Again, I would like to express my warm thanks to you! Please accept my gratitude.
Yours sincerely
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