(IP 
  (LCP-SBJ 
    (NP 
      (DNP 
        (NP 
          (ADJP 
            (JJ 关键))
                    
          (NP 
            (NN 部位)))
                    
        (DEG 的))
                    
      (NP 
        (NN 基础)
                    
        (NN 沉井)))
                    
    (LC 中))
                    
  (PU ，)
                    
  (VP 
    (ADVP 
      (AD 竟然))
                    
    (VP 
      (LB 被)
                    
      (IP-OBJ 
        (NP-SBJ 
          (NN 施工)
                    
          (NN 单位))
                    
        (VP 
          (PP-MNR 
            (P 用)
                    
            (NP 
              (NN 泥沙)))
                    
          (VP 
            (VP 
              (VV 代替)
                    
              (NP-OBJ 
                (NN 混凝土)))
                    
            (VP 
              (VV 回填)
                    
              (AS 了)
                    
              (VV 进去))))))))
arg0: 
                    施工 单位 
                
arg1: 
                    关键 部位 的 基础 沉井 中 
                
arg2: 
                    用 泥沙 
                
argm: 
                    竟然