为什么用过去完成时?Maybe we haven't realized it,but the Internet(had

为什么用过去完成时?Maybe we haven't realized it,but the Internet(had If we had the chance to do it all again,but haven't.是不是“如果我们 ___ people haven't realized the significance of protecting t 英语翻译Maybe you heard a lot about the Internet,but what is it? Maybe i haven't fell in love so long,when the time it happen I had noticed that film before, but I haven't seen it yet. 在 it's only small but it means a lot just to say we haven't fo we haven't got the videos.But we have got the books. in the end he realized he had realized his dream,but at the Maybe we can't change the life even enjoy the life.But we st I ---- the piano quite well but I haven't had time to play s The girl ,haven't had happiness