原式$$=1-1+\frac{-1\times (-1)-2}{-2+1}$$  $$=\frac{1-2}{-1}$$  $$=1$$．  故选$$\text{C}$$． 
计算：$$1-{{(-1)}^{2}}+\frac{-1\times {{(-1)}^{3}}-2}{2\times (-1)+1}=$$．

[A] $$-2$$ 
[B] $$-1$$ 
[C] $$1$$ 
[D] $$2$$ 