The social security system is designed to ______ a basic standard of living for people in financial need.

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问题 The social security system is designed to ______ a basic standard of living for people in financial need.

选项 A、secure
B、keep
C、preserve
D、maintain

答案A

解析 单词secure:保证;获得;使安全;固定。单词keep,preserve,maintain都有“保持,维护”的意思。这里的上下文都不适宜使用。
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