What impressed the boys most was the laser-simulation confrontation,（ ）soldiers jumped through flaming hoops to carry out their mission.
A、during which
B、during that
C、of which
D、by which
【正确答案】：A
【题目解析】：during 在…的时候，在…的期间；本句意为令男孩子们印象最深刻的是激光模拟对抗，在激光模拟对抗中，士兵们跳过火圈去执行任务。
