— I’m flying to Hainan Island for my holiday this weekend.—Wonderful! A. Have a good time.

问题补充：

— I’m flying to Hainan Island for my holiday this weekend.

—Wonderful!

A. Have a good time.

B. I hope so.

C. Why not?

D. With pleasure.

答案：

(答案→)A. Have a good time.

B. I hope so.

C. Why not?

D. With pleasure.

解析：英语中的固定答语。当我们听说对方有个旅游计划时，我们常常向对方表示祝贺，祝其旅途愉快，故选A。