17.关于x的不等式组$\left\{\begin{array}{l}{2x<3(x-3)}\\{\frac{x+2}{2}>x+a}\end{array}\right.$ 有四个整数解,则a的取值范围是( )
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| A. | -6≤a≤-$\frac{11}{2}$ | B. | -6<a≤-$\frac{11}{2}$ | C. | -6<a<-$\frac{11}{2}$ | D. | -6≤a<-$\frac{11}{2}$ |