It is unmon that she is a person up late .
A. accustomed to stay
B. accustomed to staying
C. used to stay
D. addicted to stay
网友回答
A. accustomed to stay
(答案→)B. accustomed to staying
C. used to stay
D. addicted to stay
解析：be accustomed to doing固定搭配，“习惯于”。做后置定语省略be。