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				23．        March 28.about 20 Chinese  cities turned off lights of major buildings for one hour．A．At          B．In           C．On          D．Of			【查看更多】
			


		
           
          


		
          
		
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          _______ March 28，about 20 Chinese cities turned off lights of major buildings for one hour．
            
          A．At          B．In          C．On          D．Of
          

			
          
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