单选题 Mr. Kim worked as an ______ before launching his own company.
A. account
B. accountable
C. accountant
D. accounting

【正确答案】 C

【答案解析】Work as an后必须接一个表示职业的单数可数名词。选项(B)accountable(应负责任的)是形容词，选项(D)accounting(会计，会计学)是不可数名词，选项(A)account(账户)不能表示职业。只有选项(C)accountant(会计，会计师)符合要求。