It is illegal for a public official to ask people for gifts or money ______ favors to them.
 
【正确答案】 D
【答案解析】 in preference to优先于;in place of代替;in agreement with同意,与……一致;in exchange for交换。其实辨析这几个介词短语的难度不大,只需要认识每一个短语中的核心词preference,exchange, place,agreement的意思即可。