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) a pay-as-you-go approach is the foundation of Social Security
(B) the foundation of Social Security is a pay-as-you-go approach
(C) the approach of Social Security is pay-as-you-go
(D) Social Security's approach is pay-as-you-go
(E) Social Security is founded on a pay-as-you-go approach
正解是E。我大概不能理解两个系统?一头雾水
谢谢啊