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【单选题】
已知函数f（x）=㏒ 1 2 （x 2 -ax-a）的值域为R，且f（x）在（-3，1- 3 ）上是增函数，则a的取值范围是（ ）A.
0≤a≤2
B.
- 9 2 ≤a≤-4
C.
-4＜a＜0
D.
a＜0
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