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          If we can keep _____  this speed, we'll arrive there in two or three hours.
          A．onB．toC．upD．a(chǎn)t
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          keep to 遵守，keep at 繼續(xù)、堅(jiān)持；keep up 保持
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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