were confident in
definitions
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past tense of being confident in (plural); having certainty or trust in someone or something at a previous timeja: 過去に誰かや何かに対して確信や信頼を持っていたこと(複数)
examples
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They were confident in their decision to move abroad.
彼らは海外に移住する決定に対して自信を持っていた。