to have been done结构怎么用Many of the crimes have gone ___,because some people dare not report them to the police.A to have been unnoticedB unnoticed帮我分析A错在哪里

have been done 和 to be done have done.have been done .had done.had been done 有什么区别?怎么用?有什么结构? to have been done是什么时态 To.have.been.done应该怎么翻译 to have been done 怎么用 to be done to have been done to have been doing 形式的造句, have been to和have done to的区别 have been done 这个是什么时态的结构 关于英语非谓语问题非谓语doing having done to do to have done to be doing being done have been done to be done to have been doing done doing,having done,to do,to have done ,to be doing,being done,have been done,to be done,to have been doin to have done,to be done,to have been done,having done在用法上有什么区别? 有没有have to been done有没有这种结构啊,那个什么动作发生在谓语之前的是什么啊,是不是还有个having done pretend to be done是什么时态?pretend to be doing pretend to have done pretend to have been done呢? 歌曲中含有TO DO ：TO BE DONE ：TO HAVE BEEN DONE ：TO HAVE DONE是班主任让查的, to be done、being done 和have been done 有什么区别啊~ 用sb/sth is said to have done/to have been done 个造个句子 非谓语动词having been done,to have been done什么时候用?举一些例子. must have been done must have done to have been done 有这个形式吗?