题目内容
17. children believe they can succeed, they will never become totally confident.
A. If B. Since
C. Once D. Unless
17. D考查状语从句的连接词。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—旦;unless除非。根据句意选D。

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题目内容
17. children believe they can succeed, they will never become totally confident.
A. If B. Since
C. Once D. Unless
17. D考查状语从句的连接词。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—旦;unless除非。根据句意选D。