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句子改错Hardlyhadsheranoutoftheroomwhenshefoundhersonhaddisappeared.答案说的是把ran改成run,为什么呢?这句子应该用过去式的啊?

题目详情
句子改错
Hardly had she ran out of the room when she found her son had disappeared.
答案说的是把ran改成run,为什么呢?这句子应该用过去式的啊?
▼优质解答
答案和解析
前半句是个倒装句,正常语序为:
She had hardly run out of the room when ...
had run out是过去完成时,run-ran-run,过去分词还是本身