(IP 
  (NP-SBJ 
    (CP 
      (WHPP-1 
        (-NONE- *OP*))
                    
      (CP 
        (IP 
          (NP-SBJ 
            (DP 
              (DT 这)
                    
              (CLP 
                (M 位)))
                    
            (NP 
              (NN 妇女)))
                    
          (VP 
            (PP-PRP 
              (-NONE- *T*-1))
                    
            (VP 
              (VV 生产)
                    
              (NP-OBJ 
                (NN 多胞胎)))))
                    
        (DEC 的)))
                    
    (NP 
      (NN 原因)))
                    
  (VP 
    (VC 是)
                    
    (PP-PRD 
      (P 因为)
                    
      (IP 
        (NP-SBJ 
          (-NONE- *pro*))
                    
        (VP 
          (VV 服用)
                    
          (AS 了)
                    
          (NP-OBJ 
            (NN 排卵)
                    
            (NN 诱发剂))))))
                    
  (PU 。))
arg0: 
                    *pro* 
                
arg1: 
                    排卵 诱发剂