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 考察狀語從句。根據(jù)語境可知，unless引導條件狀語從句，if如果，since自從，once曾經(jīng)，一旦；句義：一些專家說，除非孩子們相信他們能夠成功，否則他們永遠不會對自己完全自信。故D正確。
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