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          He smiled politely ________ Mary apologized for her drunken friends. (2012·山東，27)
          A．a(chǎn)sB．if
          C．unlessD．though
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          解析　句意為：當瑪麗因她醉酒的朋友向他道歉時，他禮貌地微笑著。if如果，引導(dǎo)條件狀語從句；unless除非，引導(dǎo)條件狀語從句；though雖然，盡管，引導(dǎo)讓步狀語從句。as可引導(dǎo)時間狀語從句，表示主從句動作同時發(fā)生或前后緊接著發(fā)生，常常譯為“(正當)……的時候，隨著……，一邊……一邊……”，故只有as符合題意。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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