study harder and harder和study hard and hard,哪个对?最好简要告诉我为什么.easy question.

问题描述:

study harder and harder和study hard and hard,哪个对?
最好简要告诉我为什么.easy question.

study harder and harder越。。越。。用比较级

more and more 结构
越来越

study harder and harder
more and more 结构
用比较级