问题
单项选择题
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
参考答案：D
解析：
A项表示“优先于”；B项表示“代替”；C项表示“同……一致，同……和 睦”；D项表示“交换”。根据句意，应选D。