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				19．I am quite busy．I don't  know           I will have time or not tonight．A．if            B．weather        C．whether        D．when			【查看更多】
			


		
           
          


		
          
		
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          I am quite busy．I don't know _________ I will have time or not tonight．
            
          A．if                 B．weather            C．whether               D．when
          

			
          
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