问题
选择题
The Education Department says that school safety has set off alarm bells with frequent reports of serious accidents ________ students got injured or killed.
A．after which
B．in which
C．by which
D．for which
答案
答案：B
考查定语从句。代替指物的先行词accidents，在从句中作地点状语，所以用in which。后半部分意为“学生在事故中受伤或死亡”。