Every now and then he would come here paying a visit to his old aunt,who lived all alone in a small
这是改错题,答案是paying错的,应该改为to pay,为什么呢?动名词不行吗?这里有什么用法的区别吗?还有后面的all是什么意思?为什么会出现一个all呢?麻烦解释一下吧,谢谢