It is generally believed that teaching is a
science.
A an art much as B much an art as
C as an art much as D.as much an art as.
请各位帮助，谢谢！

It is generally believed that teaching is ..............a science.

A an art much as B much an art as
C as an art much as D.as much an art as.

much 不能用来修饰名词，排除 B, D.

C "貌"似同级比较 as..as..可拿的是名词来比较，不对，应该是“as + 形容词/副词 + as + 比的对象”. 比如：she's as pretty as her sisters. 她和她的姐妹们一样漂亮。留意,这和另外一种情况不是一回事：we treat her as our friend. 我们把她当朋友对待。这个as 是介词，等于like,后面加名词没问题。