航班应在起飞前48小时确认。
Flights should be ___confirmed 48 hours before departure.
他的妻子证实他那天早上离开了房子。
His wife ___confirmed that he had left the house that morning.
领袖的演讲令人印象深刻，并证实了她对党的信念。
The leader's speech was impressive and ___confirmed her faith in the party.
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