補充 be / get used to + N or Ving
e.g. After becoming an engineer, I am used to working day and night.
Mark used to be a teacher, but now he is a CEO in an international company.
Mark曾經是一位老師,但他現在是一家國際公司的首席執行官。
Mark ________ be a teacher, but now he i..-阿摩線上測驗