The design all the ages and social groups is not easy to make.
A. appealed to
B. being appealed to
C. to be appealed to
D. appealing to
网友回答
A. appealed to
B. being appealed to
C. to be appealed to
(答案→)D. appealing to
解析：考查现在分词做定语。固定词组appeal to吸引，迎合；the design与appeal to之间构成主动关系，故使用现在分词的形式。句意：迎合所有年龄的设计是很难制定出来的。故D正确。