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e[仮定法過去完了](あの時)…した[であった]ら‖If we had [((正式)) Had we] gone to his rescue five minutes later, the child would have d🔗🔉

e[仮定法過去完了](あの時)…した[であった]ら‖If we had [((正式)) Had we] gone to his rescue five minutes later, the child would have drowned. 救助に行くのが5分遅れていたらその子は溺死していただろう.

ジーニアス英和大辞典 ページ 41294 でのあの時(正式単語。