一道英语语法题
Safetyinschoolhasbeenofgreatconcernbecauseoffrequentreportsaboutaccidents___studentsgotinjuredorkilledwhileinschool.
A.whyB.whenC.inwhichD.forwhich
为什么要选C,A为什么错?介词+which到底该怎麼判断?
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