问题
Mary __________ every day after school, but now she __________ all the time.
A:used to play, is used to study
B:used to play, is used to studying
C:is used to play, used to study
D:is used to playing, used to study;
B:used to play, is used to studying
C:is used to play, used to study
D:is used to playing, used to study;
正确答案是：
