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          I often spend one hour and a half _____ my homework. 

          A. do 
          B. doing 
          C. to do 
          D. did 
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				B				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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