___ waste water was put into the rivers, and lakes which were badly polluted.
A: At one time
B: At a time
C: One time
D: A time
A: At one time
B: At a time
C: One time
D: A time
举一反三
- ______ did I feel they were being unreasonable. A: At no time B: At a time C: At one time D: For a time
- ________ there were not so many stores on the streets. A: At a time B: At the same time C: At one time D: At any time
- （） , the policemen got to the spot where the murder happened. A: In no time B: At one time C: In any time D: At a time
- You can borrow three books ______. ______ , or even more. A: at the time B: at a time C: in one time D: at 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