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【单选题】
已知函数f(x)=2sin(ωx+φ),x∈R,其中ω>0,-π<φ≤π。若函数f(x)的最小正周期为6π,且当x= 时,f(x)取得最大值,则 [ ]
A.
f(x)在区间[-2π,0]上是增函数
B.
f(x)在区间[-3π,-π]上是增函数
C.
f(x)在区间[3π,5π]上是减函数
D.
f(x)在区间[4π,6π]上是减函数
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