Jack, I’m afraid I’ll turn to you．I think chemistry is physics．
A. as a difficult subject as
B. a subject the same difficult as
C. as difficult a subject as
D. the same difficult subject as
网友回答
A. as a difficult subject as
B. a subject the same difficult as
(答案→)C. as difficult a subject as
D. the same difficult subject as
解析：考查as + adj. + (a/an) + n. + as结构，句意：我认为化学和物理是一样难的学科。故选C。