He ___________________ (在保存体力) for the last twenty-metre dash.
举一反三
- At last, about twenty people ______ at the meeting.
- 改写成被动：This company has manufactured medicine for the last twenty years. = ________________ for the twenty years.
- This company has manufactured medicine for the last twenty years.
- In his _________, he was ever a good hunter. A: twenty B: twenty ages C: age twenty D: twenties
- He _____ _______ here for over twenty years.(work)