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          I sometimes help my mom with her housework____________ Saturdays.
          A．a(chǎn)t B．inC．on D．to
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C

          試題分析：在表示時(shí)間時(shí)，at表示在時(shí)間的一點(diǎn)；on 表示在具體某一天； in表示在一個(gè)時(shí)間范圍，或者接一段時(shí)間，表示多久之后；to表示差幾分到幾點(diǎn)。句意：在周六，我有時(shí)幫助我的母親做家務(wù)。根據(jù)下文Saturdays，可知本句中表示在具體某一天，故用介詞on。選C。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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