【題目】All Mrs Smith's efforts to tidy the room were _____ because her grandson soon made a mess of it again.

A. at all costs B. at random

C. in vain D. in return

【答案】C

【解析】試題分析：考查介詞短語辨析A. at all costs不惜代價；B. at random任意地；C. in vain浪費(fèi)地；D. in return回報；句意：史密斯女士清掃屋子的所有努力白費(fèi)了因為她的外孫又弄亂了，根據(jù)句意可知選C項。

考點 : 考查介詞短語辨析

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