1. For a convex $n$-sided polygon, the sum of $n-1$ interior angles, except one, is $1993^{\circ}$, then the value of $n$ is ).
(A) 12
(B) 13
(C) 14
(D) None of the above
1. $\mathrm{C}\left(\right.$ Prompt: $\left.1993^{\circ}=11 \times 180^{\circ}+13^{\circ}\right)$