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          David didn’t give up ______ he had failed in the experiment four times．
          A．ifB．whileC．thoughD．since
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          此題考查連詞，though引導(dǎo)讓步狀語從句，表示盡管。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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