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conference
mastery UK /ˈkɒn.f(ə.)ɹəns/ US /ˈkɑn.f(ə.)ɹəns/nounverb
card 1 of 10 · preposition
We attended a useful conference _____ climate change last month.
card 1 of 10 · preposition
We attended a useful conference _____ climate change last month.