You won't pass the exam _____you study hard.
A. if                     B. when               C. Unless
C

試題分析：句意：除非你努力學(xué)習(xí)，否則你就不會(huì)通過(guò)考試。if：如果，when：當(dāng)---時(shí)候，unless：除非---，引導(dǎo)條件狀語(yǔ)從句。結(jié)合語(yǔ)境可知應(yīng)選C。
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