单选题 In 2006, she was elected ______ chairman of the Student Union.
【正确答案】 C
【答案解析】本题考查冠词的用法。在表示抽象品质或职务时，其前无需加冠词。如：
(1) John was captain of the team.
(2) He became king.
译文：2006年，她当选学生会主席。