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(yǔ)從句。根據(jù)語(yǔ)境可知，unless引導(dǎo)條件狀語(yǔ)從句，if如果，since自從，once曾經(jīng)，一旦；句義：一些專(zhuān)家說(shuō)，除非孩子們相信他們能夠成功，否則他們永遠(yuǎn)不會(huì)對(duì)自己完全自信。故D正確。
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