专题2 动词的时态和语态及情态动词_4
（北京市朝阳区2016届高三第二次（5月）综合练习）Social and cultural activities for senior citizens ______ over the past several years.A．conducted B．were conductedC．have conducted D．have been conducted
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（北京市朝阳区2016届高三第二次（5月）综合练习）Social and cultural activities for senior citizens ______ over the past several years.A．conducted B．were conductedC．have conducted D．have been conducted