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          A computer ______ think for itself. It’s always told to do things.
          A. mustn’t        B. can’t           C. shouldn’t
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B 
          因?yàn)閙ustn’t 意為“不允許，禁止”； can’t意為“不可能”； shouldn’t意為“不應(yīng)該”。此處句子強(qiáng)調(diào)的是：電腦不能夠自己思考，只能服從人類(lèi)的指令。所以B合適。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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