have been on

have been on have been on加什么 have been on的用法 have lasted 和have been on区别 have been to 和 have been in 和have been on有什么区别 have already been on 意思是 been in have been to have been on的意思以及用法 have begun 和have been on的区别 have been on 跟 have been doing有什么区别吗? Helicopters have only been worked on by man since 1940. All my successes have been built on my failures.翻译 It couldn't have been on the moon.