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【单选题】
若函数f（x）=4x 2 -kx-8在[5，8]上是单调函数，则k的取值范围是（ ）A.
（-∞，40]
B.
[40，64]
C.
（-∞，40]∪[64，+∞）
D.
[64，+∞）
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