Complex Question Answering, in which the question corresponds to multiple triples in knowledge base, has attracted researchers' attentions recently (Bao et al., 2014;Xu et al., 2016;Berant and Liang, 2014;Bast and Haussmann, 2015;Yih et al., 2015).
most of existing solutions employ the predefined patterns or templates in understanding complex questions.