Gaokao Math Practice Question
8. （5 分）函数 $f(x)=\ln \left(x^{2}-2 x-8 ）\right.$ 的单调递增区间是（ $)$
- A.$(-\infty,-2)$
- B.$(-\infty,-1)$
- C.$(1,+\infty)$
- D.$(4,+\infty)$
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