the distance was too far and the time was short we decided to fly there instead of going

问题补充：

the distance was too far and the time was short, we decided to fly there instead of going there by train.

A. Discovering

B. To discover

C. To have discovered

D. Discovered

答案：

(答案→)A. Discovering

B. To discover

C. To have discovered

D. Discovered

解析：考查分词做状语。Discover与主语we之间构成主动关系，故使用现在分词做状语。句意：当我们发现距离太远，时间太远的时候，我们觉得坐飞机去那儿，而不是坐火车。故A正确。