题目内容
______ 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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