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          -This problem is very difficult.       -I know,but Jack has           working it out. 
          A．succeed in B．succeeds in C．succeeding in D．succeeded in 
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          

          解析試題分析：句意：這道題非常難�！抑�，但是杰克已經(jīng)成功的計(jì)算出它來了。結(jié)合語境可知本句描述的是現(xiàn)在已經(jīng)完成的動作，故用現(xiàn)在完成時(shí)態(tài)。選Ｄ。
          考點(diǎn)：考查時(shí)態(tài)
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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