9.He came to the party without (being invited).(invite) 10.Don't keep me (waiting)for a long time .
问题描述：
9.He came to the party without (being invited).(invite) 10.Don't keep me (waiting)for a long time .
答
without 介词 后面动词要加ing
keep sb doing sth 固定用法 使某人一直做某事