题目内容

Some experts have said that ________ children believe they can succeed, they will never become totally confident of themselves.
A．ifB．since
C．once D．unless
D
D 考察状语从句。根据语境可知，unless引导条件状语从句，if如果，since自从，once曾经，一旦；句义：一些专家说，除非孩子们相信他们能够成功，否则他们永远不会对自己完全自信。故D正确。
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