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17.We tried all sorts of medicine but they were all ______.(  )
A.usefullyB.usefulC.uselesslyD.useless

分析 我们尝试了各种药但是都没有用.

解答 答案是D.本题考查词义辨析.A项副词表示"有用"; B项形容词表示"有用的";C项副词表示"无用";D项形容词表示"无用的";be 动词were后需要形容词,排除A和C;故根据句意所有的药都"无用",答案选D.

点评 形容词辨析的关键在于积累词汇和一些相关的固定搭配,在此基础上结合语境,做出合理的判断.

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