---Can I pass the exam this time，Mr.Li?
---I don’t think you can________ you work hard.
A．unlessB．untilC．ifD．when
A

試題分析：A.unless 除非，B.until直到，C.if如果，D.when當(dāng)…時候，句意：--這次我能通過考試嗎，李先生？--我想你不能除非你努力。選A。
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