After leave the party, we stopped for hamburgers.

After leave the party, we stopped for hamburgers.
【正确答案】：leave → leaving
【题目解析】：一个句子中只能有一个谓语动词，后面已经有stopped了，所以前面要用非谓语；we与leave之间是主动关系，故用现在分词做非谓语。