He goes to school by bus but after school.A. walk homeB. walks to homeC. on foot homeD.

问题补充：

He goes to school by bus, but after school.

A. walk home

B. walks to home

C. on foot home

D. walks home

答案：

A. walk home

B. walks to home

C. on foot home

(答案→)D. walks home

解析：语法上看缺少与goes to school并列的动词短语. 由于home在此时副词，所以介词to省略。句意:他坐公共汽车回家，但是放学走回家。结合语境可知选D。