お世話になっております。
承蒙关照。
感谢您的协助。
与您合作是我的荣幸。
Thank you for your assistance.
It has always been a pleasure to work with you.
Thank you for your continued support.
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お世話になる, おせわになる
1. to receive favor, to receive assistance, to receive help, to be looked after, to be taken care of, to become dependent (on), to become much obliged (to someone), to become indebted
蒙恩惠,得帮助,受援助,受照料,受关怀,依赖(于),感激(于某人),欠人情