1. After the war£¬a new school building was put up ________ there had once been a thea tre.
A. that        B. where        C. which        D. when
2. ____ he took part in the competition, he won a second prize.
   A. For the first time         B. At a time           C. At one time            D. The first time
3. I would appreciate it _______ you call back this afternoon for the doctor’s appointment.
A. until        B. if        C. when        D. that