one weeks' time还是 one week's time?He will finish reading the book in _____答案是one weeks' time 可是one是单数啊?week不加S啊?

问题描述:

one weeks' time还是 one week's time?
He will finish reading the book in _____
答案是one weeks' time 可是one是单数啊?week不加S啊?