________, people thought that the Earth was flat.
A: At all times
B: At a time
C: At the time
D: At one time
A: At all times
B: At a time
C: At the time
D: At one time
举一反三
- _____ I used to go mountain-climbing every summer. A: At one time B: At times C: All the time D: On time
- 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
- 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
- The earth is nearly ________ the moon. A: 50 time as big as B: 50 time the size of C: 50 times as size as D: 50 times the size of
- Strange things happen to time when you travel because （）. A: no day really has twenty-four hours B: the earth is divided into time zones C: time zones are not all the same size D: no one knows where time zones begin