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【单选题】
关于函数f（x）=3 x -3 -x （x∈R），下列结论，正确的是（　　） ①f（x）的值域为R； ②f（x）是R上的增函数； ③?x∈R，f（-x）+f（x）=0成立．
A.
①②③
B.
①③
C.
①②
D.
②③
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