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          Please don't call me at the office        it's really necessary．
          A．ifB．unlessC．otherwiseD．except
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：考查連詞：句意：請不要打電話到我的辦公室，除非是真的有必要。 A．if如果，引導條件狀語從句，B．unless除非，引導條件狀語從句，C．otherwise副詞，否則，D．except介詞“除了”，選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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