问题补充：
---Mr. Huang, National Day is coming…
--- ? Just occupy yourself in your study．
A. So what
B. What if
C. How come
D. What for
答案：
(答案→)A. So what
B. What if
C. How come
D. What for
解析：考查答案意思，So what意思“那又如何”，What if意思“要是…又怎样”，How come意思“为什么”，What for意思“为何”，由后面的句子Just occupy yourself in your study可以知道选A
