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          _______ the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.
          A．IfB．WhileC．BecauseD．As
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
           B 本題考查連詞的用法。句意：雖然因特網(wǎng)很有用處，但我認(rèn)為在網(wǎng)上花太多的時(shí)間不是個(gè)好主意。if引導(dǎo)條件狀語(yǔ)從句；because引導(dǎo)原因狀語(yǔ)從句；while和as都可作“雖然，盡管”將，都可以引導(dǎo)讓步狀語(yǔ)從句，但as引導(dǎo)讓步狀語(yǔ)從句時(shí)要部分倒裝，while引導(dǎo)的讓步狀語(yǔ)從句用正常語(yǔ)序，且常放在主句的前面。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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