all my family, I sincerely thank you for what you have done for us.
A. On behalf of
B. In honor of
C. In case of
D. Instead of
网友回答
(答案→)A. On behalf of
B. In honor of
C. In case of
D. Instead of
解析：句意：代表我的家人，我真诚地感谢你为我们所做的一切。On behalf of代表；In honor of为了向……表示敬意；In case of万一；Instead of代替，选A。