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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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