Mr Brown makes a living ____ selling newspapers when he was young.(填一词)

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MrBrownmakesaliving____sellingnewspaperswhenhewasyoung.(填一词)MrBrownmakesaliving____sellingnewspapers

Mr Brown makes a living ____ selling newspapers when he was young.(填一词)
Mr Brown makes a living ____ selling newspapers when he was young.(填一词)

Mr Brown makes a living ____ selling newspapers when he was young.(填一词)
应该是:
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用某种手段某生用by