He asked them to come to his office one [u] [/u].
A: at a time
B: at all time
C: at times
D: at one time
A: at a time
B: at all time
C: at times
D: at one time
举一反三
- ________, people thought that the Earth was flat. A: At all times B: At a time C: At the time D: At one time
- _____ I used to go mountain-climbing every summer. A: At one time B: At times C: All the time D: On time
- We had to wait in line for 30 minutes because only a few clients were allowed in______. A: at one time B: at all times C: at certain times D: at no time
- Listening to music is one of my favorite ways to ________. A: pass the time B: pass a time C: pass time D: pass times
- Why has Jack no previous experience of volunteering? A: He devoted his time to improving his skills and gaining office experience. B: He devoted his time to helping others. C: He devoted his time to study. D: He devoted his time to his family.