Let $f(x) = \max \{x+|x|, x-[x]\}$,where $[x]$ denotes the greatest integer $\leq x$. Then,the value of $\int_{-3}^{3} f(x) dx$ is

  • A
    $0$
  • B
    $51/2$
  • C
    $21/2$
  • D
    $1$

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