seventy mile an hour前跟什么介词

seventy mile an hour前跟什么介词 You needn't drive at seventy miles an hour. you must have been driving at seventy miles an hour为什么要用ing 改错:she rans half a mile in half an hour.嘻嘻..我英语太烂了 YOU MUST have been driving at seventy miles an hour.这里去掉AT可以吗at的作用是什么 (Seventy) minutes (make) (an hour)（请在下列句子中带括号的中指出错误的一处,并改正.同时请说明知识点.） You must have been driving at seventy miles an/per hour.你刚才一定是以每小时70英里的速度开车.1.为什么要用ing And later the train was ____ at seventy kilometers an hour.A.walking B.iumping C.travelingA.walking B.iumping C.traveling D.beginning will后面加什么词性?如果说是动词原形的话那么请你看看新概念英语第129课Seventy miles an hour里面的一句话I'll certainly be more careful.是怎么回事? will后面加什么词性?如果说是动词原形的话那么请你看看新概念英语第129课Seventy miles an hour里面的一句话I'll certainly be more careful.是怎么回事? an hour-long half an hour later half an hour造句 an hour的中文 In an hour翻译 for an hour an hour pass by in an hour