8.化简$\frac{{x}^{2}}{x-1}$+$\frac{1}{1-x}$的结果为( )
0 279619 279627 279633 279637 279643 279645 279649 279655 279657 279663 279669 279673 279675 279679 279685 279687 279693 279697 279699 279703 279705 279709 279711 279713 279714 279715 279717 279718 279719 279721 279723 279727 279729 279733 279735 279739 279745 279747 279753 279757 279759 279763 279769 279775 279777 279783 279787 279789 279795 279799 279805 279813 366461
| A. | x-1 | B. | x+1 | C. | $\frac{{x}^{2}+1}{x-1}$ | D. | 1 |