$n$ 阶行列式 $\left|\begin{array}{ccccc}2 & 0 & \cdots & 0 & 2 \\ -1 & 2 & \cdots & 0 & 2 \\ \vdots & \vdots & \ddots & \vdots & \vdots \\ 0 & 0 & \cdots & 2 & 2 \\ 0 & 0 & \cdots & -1 & 2\end{array}\right|=$
$\text{A.}$
$\text{B.}$
$\text{C.}$
$\text{D.}$