—How does Jack usually go to school?
—He ____ ride a bike, but now he ____there to lose weight.

A．was used to; is used to walking

B．used to ; is used to walking

C．am used to walk; used to

D．used to; is used to walk

科目 英语   题型 单选题   难度 中等

知识点： 主语+系动词+表语