8.不等式$\frac{x-1}{2}-\frac{x-2}{4}$>1去分母后得( )
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| A. | 2(x-1)-x-2>1 | B. | 2(x-1)-x+2>1 | C. | 2(x-1)-x-2>4 | D. | 2(x-1)-x+2>4 |