_______ that he isn't adequate to the present job, he devotes all his spare time to studying professional

skills. [ ]

A. To concern  

B. Concerning

C. Having concerned  

D. Concerned

国家和社会治理需要法律和道德共同发挥作用，法律对道德建设起促进作用，道德对法治文化起支撑作用，二者相辅相成、相得益彰。