China has been considering raising the retirement age since 2008 to its shrinking workfor

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A. set off
B. put off
C. bring about
(答案→)D. cope with
解析：句意：2008年以来中国一直在考虑提高退休年龄来应对劳动力减少和老龄化社会的问题。cope with意为“处理，应付”，set off意为“出发；引起；动身；使爆炸”，put off 意为“推迟”，bring about   意为“带来，引来，引起，导致”。