it‘s been done这句话是什么时态?我个人觉得不是过去式加被动不是应该 it was been done吗?为

it was done 和 It has been done 的区别 having been done是什么时态? Lay back,it's all been done before这是什么意思? it's been是什么时态, it has been done 谓语 If it was thought carefully,it will have been done better.为什 must have been done是什么被动语态 Lay back it's all been done before .lay It's no use regretting what has been done. have been done 是什么时态?那have done呢? what done has been done has been done?在说说他的结构是什么时态? 英语被动时态It （was been visited） by millions of people.我写was visi