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          --- What should I do, doctor?
           ---         healthy,  you should take more exercise.
          A．KeepB．To keepC．KeepingD．To keep out
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          考查非謂語(yǔ)動(dòng)詞.句意:醫(yī)生,我該做什么?_為了保持健康,你應(yīng)該多鍛煉.不定式作目的狀語(yǔ),表示具體的將要進(jìn)行的動(dòng)作, keep out是阻止進(jìn)入的意思,keep是保持的意思,故選B.
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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