---- What did Walt Disney do after school?
---- He sold newspaper and delivered mail.
A. leave
B. left
C. leaves
D. leaving
网友回答
A. leave
B. left
C. leaves
(答案→)D. leaving
解析：句意：沃特·迪士尼离开学校之后做什么呢？他卖报纸和送邮件。after后接时间状语从句，句中省略了主语及谓语动词，he was,故此处只有D符合题意要求。