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They ___(run)out of their water and food,which worried them

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They ___(run)out of their water and food,which worried them a lot.
这里为什么用had run 而不用was running?
They ___(run)out of their water and food,which worried them
首先理解run out of 的意思:用完了
had run out of 是指已经用完了,符合逻辑
was running out of 正在用完?用完不是一个可以正在进行的动作,进行时态不合适
再问: 也就是说is running out可是解释为快用完,但是加了个of就是已经用完了吗?
再答: 如果正在的话sth is running out 主语得是物品,这样说也可以
再问: 嗯 懂了 谢谢