(IP 
  (ADVP 
    (AD 首先))
                    
  (NP-SBJ 
    (-NONE- *pro*))
                    
  (VP 
    (PP-LOC 
      (P 在)
                    
      (LCP 
        (NP 
          (DNP 
            (NP 
              (NN 阁揆))
                    
            (DEG 的))
                    
          (NP 
            (NN 人选)))
                    
        (LC 上)))
                    
    (ADVP 
      (AD 就))
                    
    (VP 
      (VV 可能)
                    
      (VP 
        (VV 难产)))))
arg0: 
                    *pro* 
                
arg1: 
                    在 阁揆 的 人选 上 
                
argm: 
                    就 
                
argm: 
                    首先