问题
选择题
Safety in school has been of great concern (关注) because of recent reports about accidents _____ students got injured or killed at school.
A．for which
B．when
C．which
D．in which
答案
答案：D
考查定语从句。句中先行词为accidents，在从句中作地点状语，故用关系词in which = where，选D。