---They like going to sleep early, don’t they?
---Yes. They are accustomed very late.
A. to stay up
B. to not stay up
C. to staying up
D. to not staying up
网友回答
A. to stay up
B. to not stay up
C. to staying up
(答案→)D. to not staying up
解析： be accustomed to sth/doing sth意思为 “习惯于……”, to为介词, 后接动名词, 再由going to sleep early可知答案为D。