问题补充：
----What are you going to do on May Day?
----. If weather permits, I may go mountain-climbing with my friends.
A. Don’t mention it
B. It doesn’t matter
C. Forget it
D. It depends
答案：
A. Don’t mention it
B. It doesn’t matter
C. Forget it
(答案→)D. It depends
解析：A. Don’t mention it不用谢，B. It doesn’t matter 没关系，C. Forget it忘了吧，D. It depends那就看情况而定了，句意：--五月节你准备做什么？--那就看情况而定了，如果天气允许的话，我就去和朋友爬山。所以选D。
