after two days' wait /after a two days' waitafter a day's waittake a half an hour's rest还是：take half an hour's resttake a two days' rest还是：take two days' resttake a day's rest怎么看的呢?请说明为什么,以及语法
问题描述：
after two days' wait /after a two days' wait
after a day's wait
take a half an hour's rest还是：take half an hour's rest
take a two days' rest还是：take two days' rest
take a day's rest
怎么看的呢?请说明为什么,以及语法
答
after two days' wait
take half an hour's rest
take two days' rest