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           I was putting on my shirt ______ my telephone rang.
          A．whileB．whenC． asD．before
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          試題分析：句意：我正在穿襯衫這時(shí)電話響了。這里用when當(dāng)…時(shí)候（時(shí)間點(diǎn)），這時(shí)，while當(dāng)…時(shí)候（表示時(shí)間段，as表示“隨著”，before在…前面，選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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