1. Why must you keep complaining __________?
A. all the time B. at times C. at a time D. at one time
2. __________ I am concerned, the idea is wholly crazy.
A. As long as B. As far as C. As soon as D. As well as
3. It was not until mid-night __________ he went back home after the experiment.
A. when B. / C. that D. before
