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【题目】Our head teacher often says, “You will not pass the exam ______ you work hard.”

A. if B. unless C. since D. when

【答案】B

【解析】句意:我们的班主任常说:"如果你们不努力学习,你们就通不过考试"。If如果,引导条件状语从句;unless除非,引导条件状语从句;since自从,因为,引导时间状语从句;when……时候,引导时间状语从句;条件状语从句用一般现在时表示一般将来时,主句用一般将来时,根据题中的时态和句意,如果不努力,就通不过考试,故此处用unless。故选B。

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