请选择ABCD(y/Y/p3S2U It is generally believed that teaching is ______it is a science.-N(^8j7D.f
A. an art much as-N(^8j7D.f
B. much an art as-N(^8j7D.f
C. as an art much as-N(^8j7D.f
D. as much an art as-N(^8j7D.f