The equation $x^5-5x^3+5x^2-1=0$ has three equal roots. If $\alpha$ and $\beta$ are the other two roots of this equation,then $\alpha+\beta+\alpha\beta=$

  • A
    $-4$
  • B
    $3$
  • C
    $-2$
  • D
    $-5$

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