it was not long before a helicopter arrived on the scene to rescue the survivors of the plane crash

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• it was not long before a helicopter arrived on the scene to rescue the survivors of the plane crash这里的,before是啥意思啊
• it was not long before a helicopter arrived on the scene to rescue the survivors of the plane crash
• arrive 后面加什么介词我知道 in为大地方 at为小地方on为 加时间但新概念二75课有一句 it was not long before a helicopter arrived on the scene to rescue the survivors of the plane crash.这里的arrive on 加了地点!求教arrive on用法还有这句中,的to 是不是引导原因状语从句,还是宾补?
• we all survived the plane crash.为什么不用from the plane crash.
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