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    精英家教网 > 高中英语 > 题目详情
    ______ children believe they can succeed, they will never become totally confident．
    A．IfB．SinceC．OnceD．Unless
    D

    试题分析：句意：除非孩子们相信他们能够成功，否则他们将不会完全有自信。If如果；Since自从；Once一旦；Unless除非，选D。
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