問題詳情
5. ______ indicate that Social Security benefits constitute the main source of income for retired Americans who are over sixty-five years of age.
(A) Official
(B) Stocks
(C) Surveys
(D) Geometers
參考答案
答案：C
難度：簡單0.738876
統計：A(121),B(17),C(631),D(39),E(0) #
個人：尚未作答書單：vocabulary、persume
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