were good at
definitions
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past tense of being good at for plural subjects; having skill or ability in a particular activity or subject in the pastja: 過去において特定の活動や科目において才能や能力を持っていたこと(複数主語)
examples
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They were good at teamwork and communication.
彼らはチームワークとコミュニケーションに長けていた。