【题目】Social and cultural activities for senior citizens ______ over the past several years.
A. conducted B. were conducted
C. have conducted D. have been conducted
在线课程【答案】D
【解析】
试题分析：句意：老年公民的社会和文化活动在过去的几年中已经在开展。 主语和动词之间是被动关系，over the past several years提示用现在完成时，故选D。