—I’m going to Hainan on vacation next week.-- .A. Have a good timeB. Not at allC. Thank yo

问题补充：

—I’m going to Hainan on vacation next week.

-- .

A. Have a good time

B. Not at all

C. Thank you

D. I have no idea

答案：

(答案→)A. Have a good time

B. Not at all

C. Thank you

D. I have no idea

解析：交际用语Have a good time玩得高兴，过得愉快； Not at all不用谢； Thank you谢谢； I have no idea我不知道。根据上文“我打算下星期去海南度假”，故应为“祝你玩得高兴”。