单选题 4.   School safety has set off alarm bells in China with frequent reports of serious accidents for which students got hurt or killed.
【正确答案】 C
【答案解析】 应改为in which/where。本题考查定语从句。这里应将for which改为in which或where,引导一个定语从句,修饰先行词accidents,并在从句中作地点状语。
   校园安全已经在中国拉响了警钟,因为频繁有学生受伤或死亡的严重事故的报道。