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          Sally has been swimming ______ four hours.   
          A．for aboutB．sinceC．a(chǎn)boutD．/
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
           本題的含義是她游泳已經(jīng)游了四個(gè)小時(shí)，表示做事時(shí)間長(zhǎng)度，用于完成時(shí)，通常用介詞for連接時(shí)間長(zhǎng)度，故選A.
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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