求助这个英语句子的单词用法
They listened to the videos as students from other cities shared their stories of how their reckless driving affected not only their lives but also those of their passengers.
请问为什么文中的shared是用ed的形式呢 可以用ing的形式吗?因为ing是表示他们是动作的发出者额.个人认为ed是已完成的了~