请问Thank you very much （） your help的前面的介词是什么?

请问Thank you very much （） your help的前面的介词是什么? Thank you very much for your help 的同义句 Thank you very much for your help的同义句 help!thank you very much 英语选择题:A:Thank you very much for your help. thank you very much for your timely help. thank you very much for your help.同义句 thank you very much for your help如何回答 —Thank you very much for your help. thank you for your help very much 变同义句 这个应该填什么介词?thank you very much--- your help 1.of 2.for 3.with Thank you very much for your letter 的同义句