one and half an hour

One and a half an hour 和An hour and a half 有什么不同 one and a half hours 和 an hour and a half 就是说 超过一个小时候 hour “一个半小时”可不可以说成one and half an hour? one and a half hour看做单数还是复数?half an hour an hour and half还是an hour and a half half an hour 与 one half hour区别 是one and half hours还是one and half hour? one and a half hours 还是hour How long does it take It takes ___ A.One and half an hour B. one hour and a half 与 an hour and a half的区别,还有后面的谓语动词到底该用单还是 one hour and a half是错的吗?老师说只能用an hour and a half,如果不行,是语法规定的 No one knows what (happen)in half an hour.