The related information can help you to operate the machine(efficient)_____.effi

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问题 The related information can help you to operate the machine(efficient)_____.

选项

答案 efficiently

解析考查形容词与副词的转换。空格在句末处，句子主谓宾结构完整，故应填入副词。因此需将efficient转换为副词形式efficiently。

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