问题补充：
I missed the last bus and had no money for a taxi; so I could do nothing but home last night.
A. to walking
B. walk
C. walking
D. walked
答案：
A. to walking
(答案→)B. walk
C. walking
D. walked
解析：考查固定词组：could do nothing but do只好做…,因为当 but 表示“除了”时，如果 but 前面有实义动词 do，动词不定式符号 to常常被省略。句意为“没赶上末班车，又没有钱打车，所以我昨晚只好步行回家”，选B。
