【题目】It is illegal for a public official to ask people for gifts or money _________ favors to them.
A.in preference to
B.in place of
C.in agreement with
D.in exchange for

【答案】D
【解析】A. in preference to优先于；B. in place of代替；C. in agreement with 同意，与…一致；D. in exchange for作为…的交换。句意：对于公务人员来说向人们索取礼物或钱来作为帮忙的交换是非法的。根据句意选D.