(IP 
  (NP-SBJ 
    (-NONE- *PRO*))
                    
  (VP 
    (VV 成为)
                    
    (NP-OBJ 
      (CP 
        (WHNP-1 
          (-NONE- *OP*))
                    
        (CP 
          (IP 
            (NP-TPC 
              (-NONE- *T*-1))
                    
            (NP-LOC 
              (NN 国内))
                    
            (NP-SBJ 
              (NN 运输)
                    
              (NN 方式))
                    
            (VP 
              (ADVP 
                (AD 最))
                    
              (VP 
                (VA 全))))
                    
          (DEC 的)))
                    
      (NP 
        (NN 港口)))))
arg0: 
                    运输 方式 
                
arg0: 
                    *T*-1 
                
argm: 
                    最 
                
argm: 
                    国内