Unlike a funded pension system, in which contributions are invested to pay future beneficiaries, a pay-as-you-go approach is the foundation of Social Security.
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Aa pay-as-you-go approach is the foundation of Social Security
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Bthe foundation of Social Security is a pay-as-you-go approach
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Cthe approach of Social Security is pay-as-you-go
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DSocial Security's approach is pay-as-you-go
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ESocial Security is founded on a pay-as-you-go approach
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正确答案: E