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          —What’s ______ most useful invention in the 20th century?
           —______ computer, I think.
          A．the, A B．a(chǎn), A C．the, TheD．/, The
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          考察冠詞。最高級(jí)前面要加冠詞，表示特指。下文指的是上文提到在20世紀(jì)最有用的發(fā)明，為特指，用定冠詞。故選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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