The social security system is designed to ______ a basic standard of living for

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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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