What do you think of +doing 还是别的 Tom has to ____ (come)back later this afernoon 为什么
问题描述：
What do you think of +doing 还是别的 Tom has to ____ (come)back later this afernoon 为什么
答
Tom has to __come__ (come)back later this afernoon
have to do sth.
What do you think of +doing /n.
答
what do you think of 可以加doing sth 或名词
应填come,have to 后加原形,意为不得不,必须做某事