I have worked with him for some time and have found that he is ________than John．A.more efficiently a workerB.a more efficient workerC.more an efficient workerD.a worker more efficiently
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B解析通常作定语修饰名词应用形容词，排除A、D.多音节规则形容词的比较级，是在其前加more.单数可数名词的不定冠词，应置于比较级形容词之前.