问题补充：
Recent accidents, forty-five people lost their lives, have renewed concerns over the safety of overnight buses.
A. that
B. where
C. which
D. when
答案：
A. that
(答案→)B. where
C. which
D. when
解析：
试题分析: 考察定语从句的关系代词和副词。句意：最近的事故中死了45人，再次使人关注夜客车的安全问题。先行词是accident,定语从句中缺地点状语，用where引导，选B
