we 'll be awayfor two weeks because we 'll have atwo week's holiday two weeks‘ holiday

we 'll be awayfor two weeks because we 'll have a
two week's holiday two weeks‘ holiday

two weeks‘ holiday 是对的.
这里是复数名词的所有格,在s 后加’.
希望能帮到,

two weeks‘ holiday两周的假期
我们将离开两周因为我们有一个两周的假期
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