(单选题)

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A.ultimate

B.unattainable

C.specific

D.expensive

参考答案：D

参考解析：

考查形容词辨析。句意：提前退休似乎是一个有价值的个人目标，但这是一个社会代价高昂的目标，使目前的公共养老金制度难以长期维持。ultimate意为“终极的”；unattainable意为“高不可攀的，难以到达的”；specific意为“具体的，特定的”；expensive意为“昂贵的”。根据下文的描述可知，提前退休会增加社会负担，加大国家财政支出，因此是昂贵的。故选D。

知识点：

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