we will have _training with the dog.A.two months' B.two months C.a two-months D.two month's

问题描述:

we will have _training with the dog.A.two months' B.two months C.a two-months D.two month's
为什么不选C捏?

选A.month的复数是months,所有格是months',2 months' training意思是为期2个月的训练.
如果C选项的话,那么month就必须不能用复数形式,也就是a two-month training=two months' training.