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    精英家教网 > 高中英语 > 题目详情
    _______ you work hard, you won’t solve this problem.
    A．EvenB．AsC．UnlessD．Since
    C
    Even即使，甚至；As因为，由于；Unless除非……否则，如果不；Since
    自从，因为。句意：除非你努力学习，否则你不能解决这道题。所以选C。
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