By 1900, most states had laws against selling cigarettes to young people.
By 1900, most states had laws against selling cigarettes to young people.
正确答案：到1900年时，大部分州都已经颁布了禁止向青少年出售香烟的法律。
By 1900, most states had laws against selling cigarettes to young people.
正确答案：到1900年时，大部分州都已经颁布了禁止向青少年出售香烟的法律。
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