问题：
[不定项选择题] When we consider great painters of the past, the study of art and the study of illusion cannot always be separated. By illusion I mean those contrivances of color, line, shape, and forth that lead us
A、They do not believe that illusionist tricks have become trivial.
B、They generally spend little time studying contemporary artists.
C、They have not given enough consideration to how the representation of nature has become commonplace.
D、They generally tend to argue about theories rather than address substantive issues.
参考答案：
C、They have not given enough consideration to how the representation of nature has become commonplace.
● 参考解析
