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mastery UK /ˈɹeɪ.ʃi.əʊ/ US /ˈɹeɪ.ʃoʊ/nounverbintj
card 1 of 10 · fill in the blank
The number of errors decreased _____ direct ratio to the amount of practice.
card 1 of 10 · fill in the blank
The number of errors decreased _____ direct ratio to the amount of practice.