A：$\left\{\begin{array}{c}x=1\\ y=-1\end{array}\right.$

B：$\left\{\begin{array}{c}x=-1\\ y=1\end{array}\right.$

C：$\left\{\begin{array}{c}x=2\\ y=0\end{array}\right.$

D：$\left\{\begin{array}{c}x=1\\ y=1\end{array}\right.$