—— are you doing for vacation Jack? –I’m going to Tibet for a week.A. What B. When C. How

问题补充：

—— are you doing for vacation, Jack?

–I’m going to Tibet for a week.

A. What B. When C. How

答案：

解析：根据I’m going to Tibet for a week“我将去西藏一周。”可知，本句应该是问“杰克，你假期将要干什么？”，故用what。所以本题选A。