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.
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. a pay-as-you-go approach is the foundation of Social Security the foundation of Social Security is a pay-as-you-go approach the approach of Social Security is pay-as-you-go Social Security's approach is pay-as-you-go Social Security is founded on a pay-as-you-go approach
答案是e,a 为什么不对呢?est 说:Choices A, illogically compare the pension system with the approach taken by Social Security itself. 不明白??