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				  Human beings must try to      ways to solve the climate problem, and save the  earth. A.  keep up with  B. catch  up with C. come on  D. come up  with			【查看更多】
			


		
           
          


		
          
		
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          Human beings must try to ____ ways to solve the climate problem, and save the earth.
            
          A. keep up with        B. catch up with      C. come on        D. come up with 
          

			
          
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