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           _____ORBIS doctor who got here yesterday needed
_______ X-ray machine to 
          


          examine his patients.
          


          A. The; a           B.
The; an          C. An; a            D.
An; an 
          


           
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				【答案】






          B
          


          【解析】此題考查冠詞的用法，the是定冠詞，表示特指；a/an是不定冠詞，表示泛指。a用在輔音音素開頭的單詞之前，an 用在元音音素開頭的單詞之前。     
          


           
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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