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          . In September 2008 , China’s key milestone
in space travel_____when Zhai Zhigang conducted the first space walk.
          


          
 
          
  
  
          A．reached
          
            		
  
  
          B．was reached
          
            		
  
  
          C．has reached
          
            		
  
  
          D．had been reached
          
            		
 
          

          


           
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				【答案】






          B
          


          【解析】略
          


           
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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