题海让大学四年没有难题
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单选题 Which of the following is a primary long-term stressor on the financial stability of the U.S. Social Security system

A. Declining payroll tax rates

B. A decreasing dependency ratio (fewer retirees per worker)

C. An aging population leading to an increasing dependency ratio

D. Excessive investment returns in the trust fund

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时间:2026-04-24 03:49:19

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