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          It is uncertain      side effect the medicine will bring about , though about one thousand patients have taken it.
          A．thatB．whetherC．whatD．how
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：句意：盡管大約1000名病人使用了這種藥，但它會帶來什么樣的副作用還不清楚。此處what修飾名詞side effect。故選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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