最佳答案:这个是对的How long haven't you + 动词过去分词..1, How long haven't you been back home?2,He
最佳答案:It's not sure that how long it will take the human beings to living in the botto
最佳答案:I have no direction!There is also no target!How long don't I know oneself an abi
最佳答案:After how long do you think people can study at home computers? The earthquake h