(CP 
  (WHNP-3 
    (-NONE- *OP*))
                    
  (CP 
    (IP 
      (NP-SBJ 
        (-NONE- *T*-3))
                    
      (VP 
        (PP-ADV 
          (P 和)
                    
          (NP 
            (NN 防暴)
                    
            (NN 警察)))
                    
        (VP 
          (VV 对质))))
                    
    (DEC 的)))
                    
(NP 
  (NN 工人)))))
arg0: 
                    *T*-3 -> 工人          
                
arg0: 
                    和 防暴 警察