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          (2012·四川)Scientists study ________ human brains work to make computers.
          A．whenB．howC．thatD．whether
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          　how引導賓語從句，并在從句中作狀語，表示方式。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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