题目内容：

That had talked only for a few minutes _____they found they were of different opinions.
为什么用before 而不用while?

优质解答

before用于时间段
while动作进行中的又一动作插入 表示一个时间点
你看你的题目 a few minutes 还有for 都是指引你解道题的关键所在