three days' trip 和 a three days' trip

three days' trip 和 a three days' trip 1 three days' trip 2 a three days' trip 3 a three-day trip 那 three days,three-days,three-days'和three-day I donnot think three days is enough for such a trip.为什么是is呢? soon shall we start the bicycle trip?A In three days' time B A three-day trip three daYs' off和three days off的区别. in three days 和for three days区别 three days later和in three days 有什么区别? three days later 的意思和用法、 与 in three days 的区别.three days ago 作文：a three-day school trip A three-day trip英语作文