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          【題目】Granny always keeps her cellphone switched off _________she's expecting a call．
          A. SinceB. unless
          C. onceD. when
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          【答案】B
          【解析】
          考查連詞詞義辨析。A. since既然；B. unless除非；C. once一旦……；D. when當……時。句意：外婆的手機總是關機，除非她在等電話。根據(jù)句意可知此處表示“除非”，故B項正確。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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