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?

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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?
• But before the party the school principal has made many rules for it；the students cannot wear接上方jeans to the party ；the students cannot bring friends from other schools；the students cannot run or smoke at the party.
• How many cars did the workers in this factory make in 2001?改成被动句