since 还是 for an hour ago

since 还是 for an hour ago 是sleep for an hour 还是 sleeping for an hour How long has peter been reading the book?选项再补充A an hour agoB before an hour agoC since an hour agoD for an hour ago 哪个对,为什么?stay the park for an hour还是stay for the park an hour for an hour I can stay an hour.还是I can stay for an hour? I have waited for you since half an hour ago 此话成立吗,意思是? i danced for an hour. a hour 还是 an hour如题如题如题 a one -hour还是an one-hour a half hour还是half an hour? 是half hour还是half an hour? 英语翻译这句是用一般过去时还是现在完成时?感觉Mun has cooked dinner an hour ago不对··用since an hour ago更不对了= = Our class teacher has been back _____half an hour A、since B、in C、 for D、after注明理由 for an hour 和an hour有什么不同. since 和 for①I’ve been running （half an hour ago/for half an hour）②Sam has been skating(since 9 o'clock/an hour ago)③-When did you get the first stamp?-(For six years/Six years ago) an hour and half还是an hour and a half half an hour passed since the train leaved.中文翻译