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【单选题】
已知函数y=f（2x-1）是定义域在R上的奇函数，函数y=g（x）是函数y=f（x）的反函数，则g（a）+g（-a）的值为（ ）A.
2
B.
-2
C.
0
D.
随a的取值而变化
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B.
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C.
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D.
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