Task7-OpenDomainQuestionAnsweringInthisyear’sNLPCCopendomainQAsharetask,wefocusonKNOWLEDGEandproposethreesub-tasks,including(a)knowledge-basedquestionanswering(KBQA),(b)knowledge-basedquestiongeneration(KBQG),and(c)knowledge-basedquestionunderstanding(KBQU).ThetaskofKBQAistoanswernatu