单选题 You______him ont though you were very busy.
  • [A] should have helped
  • [B] must help
  • [C] ought to help
  • [D] could have helped


【正确答案】 A
【答案解析】句意：你本应该帮助他离开的，尽管你很忙。[A] should have helped表示你本应该做某事(但实际你没做)，最符合题意。