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

游客2024-05-23  14

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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