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          In fact, I wonder _________ my efforts were all in vain.
          A．thatB．whichC．whyD．where
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：考查賓語從句的連接詞：句意：事實上，我想知道我的努力為什么會是徒勞。因為主句的謂語是wonder，應(yīng)該用疑問詞連接，which可以做主賓表，這句話不缺主賓表，where在哪里，不符合句意，選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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