He came _____ his mother.
A and B as early C as much D as well as
请详细讲解各个的用法及为什么
选这个而不选其他。 谢谢

选D.
as well as 用于肯定句中，起连接作用=not only...but also
既......又......；不仅......而且......
He gave me clothes as well as food.他不仅给我衣服而且给我食物。
The child is lively as well as healthy.这个孩子既健康又活泼
He came as well as his brother.不仅他而且他哥哥也来了。
She as well as I IS a teacher.我是教师，她也是。
as well as 重在强调其前面的人或事物，连接并列主语时，谓语动词和前面的人或事物保持一致。
as such
（1）.作为一个......
He is a child,and must be treated as such.他既然是个孩子，就得把他当孩子看待。
（2）本身 Success,as such,does not always bring happiness.
成功本身并不总是伴随着愉快的。