多选题 Concerning Walt Whitman, which are the correct statements? 的答案

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题目内容：
Concerning Walt Whitman, which are the correct statements?
题目选项
He enjoyed great fame and popularity when he was still young.
Leaves of Grass is an immediate success.
In his leaves of grass, openness, freedom, and individualism are all that concerned him.
. He shows concern for the whole hardworking people and the burgeoning of cities.

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