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          The fireman succeeded in saving all the people in the house on fire, _______they knew they were in great danger themselves.
          A．becauseB．sinceC．unlessD．though
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D 

          試題分析：A. because因?yàn)椋ㄒ龑?dǎo)原因狀語從句）， B. since自從（引導(dǎo)時(shí)間狀語從句），C. unless除非（引導(dǎo)條件狀語從句），D. though雖然（引導(dǎo)讓步狀語從句），句意：消防隊(duì)員成功的在著火的房間救了所有的人，即使他們知道他們自己很危險(xiǎn)。根據(jù)句意選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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