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          Frank often wears a mask ________he can keep fit in the foggy and hazy (霾) weather.
          A．only ifB．untilC．so thatD．even though
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：句意：弗蘭克經(jīng)常戴口罩所以他可以在霧霾天氣里保持健康。So that引導結(jié)果狀語從句，only if表示“只要”；even though表示“即使”，until表示“直到”，故選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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