问题
选择题
---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
答案
答案：D
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。