10.已知方程$\frac{3-a}{a-4}$-1=$\frac{2}{4-a}$,且关于x的不等式组$\left\{\begin{array}{l}{x>a}\\{x≤b}\end{array}\right.$,只有4个整数解,那么b的取值范围是( )
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| A. | 7<b≤8 | B. | 2<b≤3 | C. | 8≤b<9 | D. | 7≤b<8 |