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          It is a difficult problem for high school students      they can properly use the Internet．
          A．whatB．whereC．whenD．whether
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D               
                       
          試題分析：考查主語(yǔ)從句。句意：對(duì)于高中生來(lái)說(shuō)，他們是否能正確的利用網(wǎng)絡(luò)是一件很難的問(wèn)題。句子中it 是形式主語(yǔ)，真正主語(yǔ)是whether引導(dǎo)的主語(yǔ)從句，根據(jù)句意得出選D項(xiàng)。          
          考點(diǎn) : 考查主語(yǔ)從句
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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