英语翻译.and have been held every four years since then.是关于奥运会的have b_英语解答

英语翻译
.and have been held every four years since then.是关于奥运会的
have been 在这里当什么讲

人气：215 ℃　时间：2020-03-23 20:52:21

解答

从那时开始每四年举办一次
have been 现在完成时态