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 pastko: 과거에 특정 활동이나 과목에서 재능이나 능력을 가지고 있었다는 것 (복수 주체)
examples
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They were good at teamwork and communication.
그들은 팀워크와 의사소통에 능숙했다.