children believe they can succeed, they will never become totally confidentA. IfB. Since

发布时间：2020-08-17 09:01:45

     children believe they can succeed, they will never bee totally confident．
A. If
B. Since
C. Once
D. Unless

网友回答

A. If
B. Since
C. Once
(答案→)D. Unless
解析：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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