— him off tomorrow or you will regret it. — I will. A. To seeB. SeeingC. If you don’t se

问题补充：

— him off tomorrow, or you will regret it.

— I will.

A. To see

B. Seeing

C. If you don’t see

D. See

答案：

A. To see

B. Seeing

C. If you don’t see

(答案→)D. See

解析： 考查固定结构。祈使句，+连词+一般讲来时态的句子。所以选D.