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          Have you noticed the problem ________ he is now in low spirits？________ come?
          A．where；WhatB．that；How
          C．in which；ForD．what；As
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          that引導同位語從句，用以說明problem的內容；后面的How come“怎么會那樣”為固定搭配。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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