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          If you sit in a chair _____a long time, your back may begin to hurt.
          A．a(chǎn)tB．inC．onD．for
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          本題考查介詞。介詞for 用來引導(dǎo)一段時(shí)間。句意：如果你坐椅子很長時(shí)間，你的背部可能開始受傷。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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