单选题 After the whole day's march; they are too fatigued to walk any more.
  • A. hungry
  • B. sleepy
  • C. thirsty
  • D. tired


【正确答案】 D
【答案解析】fatigue：疲劳的，等于tired；hungry：饥饿的；sleepy：困倦的；thirsty：口渴的。