I used to——up late but now I am used

问题描述:

I used to——up late but now I am used
I used to——up late but now I am
used to——to bed early.
A.staying;go B.stay;going C.stay;go D.staying;going

B 第一个used to do sth 过去常常干某事
第二个be used to doing sth,习惯干某事