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【题目】Why do many students stick to private tutoring _____ they could easily master such knowledge at school?

A.unlessB.beforeC.afterD.when

【答案】D

【解析】

考查时间状语从句。A. unless除非;B. before在……之前;C. after在……之后;D. when 当……时候。句意:为什么许多学生可以在学校轻松掌握这些知识,却坚持私人辅导呢?根据句意可知,这是个时间状语从句,用when引导。故选D

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