UC知道when did the pain start?------About two hours before.改错
来源：百度知道 编辑：UC知道 时间：2024/06/20 08:01:49
before--ago
about two hours ago!
before-ago
把“BEFORE"改为“AGO”，ago只能用于过去时，放在表示“时间段”的词语之后，表示从现在算起的一段时间之前，before后接“时间点”，可用于任何时态
before改为ago
before主要用于过去完成时,而ago用于过去时.
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