单选题 At last John Smith chose to {{U}}step down{{/U}} as the company's chief executive and return to hisroots in software research.
  • A. resign
  • B. remove
  • C. retire
  • D. replace
【正确答案】 A
【答案解析】[解析] step down“退休，辞职，离职”，四个选项：resign“辞职”；remove“移动，搬走”；retire“退休”；replace“代替”；所以A项符合题意。