Bob did everything ______ than the other three students. Our teacher chose him to be our monitor.A.much carefulB.much carefullyC.much more carefulD.much more carefully
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D解析考查比较级的用法。根据than可知，考查比较级；排除A、B；did是动词，修饰动词用副词，careful是形容词，排除C。Much可以修饰比较级。故选D。