问题详情

It can inferred that the author views the independence from social class of the heroes and heroines of 19th century operas as______
A．a plot refinement which could be the achievement only by Verdi.
B．an idealized but accurate portrayal of bourgeois lifestyles..
C．a plot convention with no real connection to political reality.
D．a symbolic representation of the social position of aristocrats..此题为多项选择题。请帮忙给出正确答案和分析，谢谢！