(2013·陕西宝鸡二模)In his absence, I would like to thank all concerned on my brother's .
A. behalf
B. part
C. business
D. interest
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(答案→)A. behalf
B. part
C. business
D. interest
解析：选A 考查名词辨析。句意：我弟弟没在场，我想代表他向所有相关的人员表示感谢。on sb.'s behalf ＝ on behalf of sb.，为固定短语，意为“代表某人”，符合句意。for sb.'s part“就某人而言”；on business“因公”；in sb.'s interest“为了某人的利益”。