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

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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)

Mr Brown makes a living ____ selling newspapers when he was young.(填一词)
应该是:
by
通过什么谋生,用by

by/through 通过

用某种手段某生用by