With our country entering an aging society, the retirement age is probably unavoidable.
A. having delayed
B. delaying
C. being delayed
D. to be delayed
网友回答
A. having delayed
(答案→)B. delaying
C. being delayed
D. to be delayed
解析：句意：随着社会进入老龄社会，延迟退休年龄可能是难以避免的。分析句子成分可知，这句话的主语是 the retirement age，所以用动名词做主语，所以选B。