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Some students even have no idea of   they are studying, so they are aimless most of the time.
A.whoB.when
C.whereD.why
选D。考查宾语从句。句意: 一些学生甚至不知道他们为什么学习, 所以他们大部分时间漫无目的。根据语境aimless推知“不知道学习的原因”, 故答案D合适。
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