□ABCD的对角线的交点在坐标原点，且AD平行于x轴，若A点坐标为(－1，2)，则C点的坐标为[ ]

(A)(1，－2)

(B)(2，－1)

(C)(1，－3)

(D)(2，－3)

We won't go to the Great Wall if it ____ tomorrow.[ ]

A. rains

B. rain

C. will rain

D. is raining