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using
mastery UK /ˈjuː.zɪŋ/ US /ˈju.zɪŋ/noun
card 1 of 10 · fill in the blank
I've been _____ a dictionary to help me understand difficult words in this book.
card 1 of 10 · fill in the blank
I've been _____ a dictionary to help me understand difficult words in this book.