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          Small sailboats can easily turn over in the water _____ they are not managed carefully. 

          A. though 
          B. before 
          C. until 
          D. if 
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				D				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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