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          The traditional view is ______ we sleep because our brain is “programmed” to make us do so. 
            
          A. when            B. why              C. whether              D. that
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
             
          解析:
               
          主要測(cè)試表語(yǔ)從句。結(jié)合語(yǔ)境可知句子意思為：傳統(tǒng)的觀點(diǎn)是因?yàn)槲覀兊拇竽X已經(jīng)設(shè)定好讓我們睡覺(jué)，所以我們睡覺(jué)。由以上譯文可知句子中并不缺少任何成分只是少了應(yīng)道表語(yǔ)從句的引導(dǎo)詞。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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