问题
选择题
Miami and Oklahoma City, both of ______were the last two undefeated teams in the NBA this season, lost for the first time on January 3rd.
A．whom
B．them
C．which
D．those
答案
C
题目分析：句意：迈阿密热火队和俄克拉荷马城雷霆队于2013年1月3日首次败北，他们都是NBA这个赛季最后被击败的球队。逗号前后都是句子，所以这里缺少连词，故排除BD；这里是非限制性定语从句，先行词是Miami and Oklahoma City，故选C。