单选题 Mary, accompanied by her brothers, ______ warmly welcomed by the audience.

【正确答案】 C
【答案解析】本句中主语是单数，尽管后面跟有as well as，with，together with等引起的短语，谓语动词仍用单数形式。主语如果是复数，谓语就用复数形式。