问题补充：
Liu Zhuiheng , is suspected of setting off an explosion at a tax office on July 30 in Hunan Province , four people were killed and 19 injured , is taken into police custody(拘留) in Changsha in this undated photo.
A. that ; in which
B. that ; where
C. who ; in which
D. who ; which
答案：
A. that ; in which
B. that ; where
(答案→)C. who ; in which
D. who ; which
解析：句意：在这张未注明日期的照片中涉嫌在7月30日湖南省的一个税务办公室引发4人死亡,19人受伤的爆炸的刘志恒, 在长沙被警方拘留。第一空填who，引导定语从句，先行词是Liu Zhuiheng ,在定语从句中做主语，第二空填in which还是引导定语从句，先行词是an explosion，定语从句中缺少地点状语，选C。
