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。