楼上的这位我大部分赞同,但这题恐怕A答案更好,我曾经总结过网上所有的这些词的区别. join in强调加入某项正在进行的 活动,尤其指和其他人一起参加某项活动. 我写下的例句就是: May I join in the game? I hope you'll all join in the discussion.所以join in比较好吧 而且是join the army
D join后面加人比较多,结构为join sb in doing,意为加放某人做某事. 比如:would you like to join us? He joined us in playing football. join in后面加组织,团体,队伍 He joined in the army last year. take part ...