Safety in school has been of great concern because of frequent reports about accidents _______ students got injured or killed while in schoolA.thatB.whenC.in whichD.for which
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C解析考查定语从句。句意“校园安全已经引起了很大的关注，因为学生在学校受伤或死亡的频繁报道。”而定语从句不缺少成分，先行词accidents“在事故中”，指抽象的地点，故用where或in which。故选C。