(VP 
  (VV 反驳)
                    
  (AS 了)
                    
  (IP-OBJ 
    (CP 
      (WHNP-2 
        (-NONE- *OP*))
                    
      (CP 
        (IP 
          (NP-SBJ 
            (NP-PN 
              (NR 美国))
                    
            (NP 
              (NN 官方)))
                    
          (VP 
            (MSP 所)
                    
            (VP 
              (VV 声称)
                    
              (NP-OBJ 
                (-NONE- *T*-2)))))
                    
        (DEC 的)))
                    
    (IP 
      (NP-SBJ 
        (DP 
          (DT 这)
                    
          (CLP 
            (M 个)))
                    
        (NP 
          (NN 防空洞)))
                    
      (VP 
        (VC 是)
                    
        (NP-PRD 
          (QP 
            (CD 一)
                    
            (CLP 
              (M 个)))
                    
          (CP 
            (WHNP-3 
              (-NONE- *OP*))
                    
            (CP 
              (IP 
                (NP-SBJ 
                  (-NONE- *T*-3))
                    
                (VP 
                  (SB 被)
                    
                  (VP 
                    (VV 伪装))))
                    
              (DEC 的)))
                    
          (ADJP 
            (JJ 军事))
                    
          (NP 
            (NN 掩体)))))))
arg1: 
                    *T*-3 
                

arg0: