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          Computers first came into use ________.
          A. in 1950s                B. on the 1950s            C. in the 1950s
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：句意:電腦首次被使用是在20世紀(jì)50年代。在某個(gè)世紀(jì)某個(gè)年代應(yīng)該用介詞in，還應(yīng)該在in后用定冠詞，在數(shù)字后加s,根據(jù)句意故選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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