$f(x) = \begin{cases} \frac{\log x}{x-1}, & \text{if } x \neq 1 \\ k, & \text{if } x=1 \end{cases}$ is continuous at $x=1$,then the value of $k$ is

  • A
    $0$
  • B
    $-1$
  • C
    $1$
  • D
    $e$

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