【题目】--It is a long time since I saw my sister.
-- her this weekend?
A. Why not visit
B. Why not to visit
C. why not visiting
D. why don＇t visit
在线课程【答案】A
【解析】Why not + do 是固定用法，也就是说Why 和 not 中间是不能加其他词的。 像D选项就错在这，已经不是Why not 解构了，要说的话是Why don't you visit?