题目内容

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 whichB.in whichC.by whichD.for which
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”。
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