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           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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