(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
REL: 服用