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Gaokao Math Practice Question

函数 $f(x)$ 的定义域为 $R$, 若 $f(x+1)$ 与 $f(x-1)$ 都是奇函数, 则 ($\qquad$)

  1. A.$f(x)$ 是偶函数
  2. B.$f(x)$ 是奇函数
  3. C.$f(x)=f(x+2)$
  4. D.$f(x+3)$ 是奇函数

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