We should pay close attention to safety in schools because of frequent reports about accid

问题补充：

We should pay close attention to safety in schools because of frequent reports about accidents students got injured or killed while in school.

A. which

B. for which

C. in which

D. what

答案：

A. which

B. for which

(答案→)C. in which

D. what

解析：考查定语从句，先行词是accidents，定语从句缺少地点状语，用where或in which，句意是：我们应该密切关注校园安全因为经常会有学生在校受伤或死亡的事件的报导。选C。