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          Some scientists think that it will take __ of years to make robots do most work for humans.
           A. hundreds               B. hundred                C. thousand
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          考查數(shù)詞的用法。固定短語hundreds of“成百上千”、thousands of“成千上萬”；如果前面沒有具體的數(shù)字，常用復(fù)數(shù)加of結(jié)構(gòu)表示不確切的數(shù)字。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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