since then,i _________ more and more differences between chinese _英语解答

since then,i _________ more and more differences between chinese and us cultures
填discovered 还是have discovered,为什么

人气：206 ℃　时间：2020-04-11 22:46:36

解答

have discovered,有since的句子里应该用完成时,也就是have+分词.
另外,us是不是改成our更好~