问题
Didn’t your brother ___ go to school by bike —Yes, he did. But he __ walking to school now.
A:used to; used to
B:use to; used to
C:used to; is used to
D:use to; is used to;
B:use to; used to
C:used to; is used to
D:use to; is used to;
正确答案是：
