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          David doesn’t give up _______ he has failed in the experiment four times.
          A．ifB．whileC．thoughD．since
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          連詞辨析。if 是否，如果；while當(dāng)……時(shí)，然而；though雖然，盡管；since自從……以來(lái)，由于。句意：盡管他在實(shí)驗(yàn)中已經(jīng)失敗了四次，但是戴維德還不放棄。故選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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