--What you for your vacation?
--I plan to visit my grandparents.
A. do, do
B. are, doing
C. did, do
D. are, do
网友回答
A. do, do
(答案→)B. are, doing
C. did, do
D. are, do
解析：what are you doing for vacation?你假期准备做什么？
用现在进行时态表示将来时，结构是be+doing，意思是对将来的一种打算，翻译是计划，将要。