He tried and tried but all his efforts were ______.

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问题 He tried and tried but all his efforts were ______.

选项 A、in no way
B、on the contrary
C、at a loss
D、of no avail

答案D

解析 of no avail指“无用的，无效的”，与句意相符。in no way“绝不，无论如何不”；on the contrary“相反地”；at a loss“不知所措”。

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专业英语四级

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