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          --Our environment is getting Worse than before．
            
          --You’re right．But thanks to Earth Day, people have done more and more useful things to protect(保護(hù))the earth since Earth Day               ．
            
          A．is started              B．was started          C．has started
            
            
         
        
         			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				  
            
          1、B
            
            				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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          --Our environment is getting Worse than before．
            
          --You’re right．But thanks to Earth Day, people have done more and more useful things to protect(保護(hù))the earth since Earth Day               ．
            
          A．is started              B．was started          C．has started
          

			
          
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