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设 $0 < a < b < 1,0 < c < 1$ ,则
A. $\ln \left(c^a+1\right)>\ln \left(c^b+1\right)$     B. $(c+1)^a < (c+1)^b$     C. $a^b>a^a>b^a$     D. $\log _c a < \log _c b$         
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