I can't thank you enough. 不胜感激
Thank you for contributing so much to the pleasure of our stay in ...
感谢您为使我们在……的停留期间的愉快所作的许多努力。
I couldn't have done it without you.
若是没有你，我不可能做到。
Thank you very much (ever so much) (most sincerely) (indeed) (from the bottom of my heart)很（非常）（最真诚地）（确实）（衷心）感谢您。
Your help was greatly appreciated.
你的帮助备受感激。
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