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【題目】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】

考查時(shí)間狀語(yǔ)從句。A. unless除非；B. before在……之前；C. after在……之后；D. when 當(dāng)……時(shí)候。句意：為什么許多學(xué)生可以在學(xué)校輕松掌握這些知識(shí)，卻堅(jiān)持私人輔導(dǎo)呢？根據(jù)句意可知，這是個(gè)時(shí)間狀語(yǔ)從句，用when引導(dǎo)。故選D。

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