Sally is very happy.There is a big smile to her face .为什么要用to

问题描述:

Sally is very happy.There is a big smile to her face .为什么要用to

用 on 也可以

这是指对谁
萨利很高兴,给了他一个大大的笑容.这句话是对另一个人的脸,所以用to