Many a student _______ that mistake before.

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Many a student _______ that mistake before.
是had made 还是has made?before不是过去时的标志吗?had made过去完成时放在句子中不行吗?

应该是 has made
分析 before 以前,常与现在完成时连用.
加油!不明白再问!
再问：所以before是现在完成时的时态标志吗？
再答：是的，还有 already , yet ,just 等
再问： I had fallen asleep before you came back。这个是过去完成时啊
再答：注意，这句中的before 是介词‘ 在……之前’ 因为动词发生在CAME 之前，所以主句要用过去完成时。

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