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______ children believe they can succeed, they will never become totally confident.

A.If B.Since C.Once D.Unless

D

解析试题分析: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。
考点:考查词义辨析

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