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【单选题】
对于函数 ，若存在 ,使 成立，则称 为 的不动点. 已知函数 ，若对任意实数b，函数 恒有两个相异的不动点，则实数 的取值范围是 （ ）A.
(0,1)
B.
（1，+∞）
C.
［0，1)
D.
以上都不对
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B.
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