15 minutes walk和 15 minutes' walk哪个对?为什么?
问题描述：
15 minutes walk和 15 minutes' walk哪个对?为什么?
--how far is it from your home to the school
--it's fifteen( ).
a.minute's on foot.b.minutes on foot.c.minutes' by foot.d.minutes' on foot
选哪一个?为什么?理由?
答
b.It is fifteen minutes on foot.
fifteen minutes :复数加
on foot :用走的
15 minutes' walk :OK
a 15-minute walk.:OK