问题
选择题
After his operation, the old man was back ______ and he began to take exercise as usual.
A．at his feet
B．to his feet
C．in his feet
D．on his feet
答案
答案：D
题目分析:考查固定短语。根据句中After his operation和take exercise as usual.可以判断应该是病后恢复，短语on his feet可以指“病后复原”，所以D选项正确。句意：手术后，这个老人又重新恢复了健康并且开始像往常一样锻炼身体了。