dear   ______ ,

①i am writing to extend my sincere gratitude for ______（感谢的原因）. ②if it had not been for your assistance in  ______（对方给予的具体帮助）, i fear that i would have been ______（没有对方帮助时的后果）.

③every one agrees that it was you who ______（给出细节）.

④again, i would like to express my warm thanks to you! please accept my gratitude.

yours sincerely,

li ming
 

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