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          Computers are very useful in our lives, but they must        properly.
          A. use                 B. be using                C. be used
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：句意：電腦在我們的生活中非常有用，但是必須恰當(dāng)?shù)厥褂盟鼈�。結(jié)合語境可知下文主語是動(dòng)作對象，故用被動(dòng)語態(tài)，選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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