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           I’ll be back _____ 5 o’clock tomorrow afternoon.
          A．a(chǎn)boutB．a(chǎn)roundC．untilD．for
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
           about是副詞，表示具體的時(shí)點(diǎn)要加介詞at；around是介詞，大約的意思。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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