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          Christmas ________ important festival in the USA.
          A. is a     B. is an    C. are a    D. are an
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：句意：在美國(guó)，圣誕節(jié)是一個(gè)重要的節(jié)日。結(jié)合語(yǔ)境可知本句中泛指任何一個(gè)重要節(jié)日，故謂語(yǔ)動(dòng)詞用單數(shù)，important詞首音素是元音，故不定冠詞用an，選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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