【题目】Having been treated in the hospital for as long as six months, the man injured in the car crash is now eventually back _______ his feet.
A. atB. in
C. onD. to
在线课程【答案】C
【解析】
考查固定短语。句意：在医院接受了长达六个月的治疗后，在车祸中受伤的那个人现在终于恢复了健康。be back on one’s feet意为“恢复；完全复原”，为固定短语。故C选项正确。