Some concrete actions were taken to improve the living conditions there but prov

游客2023-09-06 69

问题 Some concrete actions were taken to improve the living conditions there but proved to be __________.

选项 A、at a premium
B、to no avail
C、of their own accord
D、on the alert

答案 B

解析采取了一些具体的措施来改善那里的生活条件，但是不见效果。本题是考查介词词组的用法。at a premium“奇缺的，难得的”；to no avail“完全无用”；of one’s own accord“出于自愿的，主动的”；on the alert“警觉的，随时准备做……”。

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