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He always does something casually. So casually is a ______ in his character. A. proficiency B. defect C. virtue D. appendix [proficiency] deficient 缺乏的 proficient 精通 efficient 有效的 sufficient 足够的 [/proficiency] [defect] defect 缺点 perfect 完美，完善 affect 影响，侵袭 effect 效应，后果 [/defect] [virtue] virtue 优点，美德 virus 病毒 virose 有毒的 virgin 处女 Virgo 处女星座 appendix 附录，附属物 | 
