英語題,急求答案及解析

題目：

英語題,急求答案及解析
It is generally believed that teaching is ______it is a snience.
A an art much as
B much an art as
C ans an art much as
D as much an art as
能告訴我選什麼和爲什麼選嗎

解答：

D
as..as用在比較級的時候中間接的是adj./adv.
如果要加名詞的話..名詞要放在adj.後..
as + adj. + a/an + n.+as