... people are reluctant to let younger people into government then it could affect the ability of future leaders.再就是,then这样用可以么?then是副词,放在一个句子里,不是前后需要加逗号么?谢谢老师。
Kristin Diehl conducted a series of experiments on photo-taking to find out whether people enjoyed it when they did sightseeing.过去式did后面为什么用ing形式(有did doing句型吗)?