简单说来,因为句子中用的是be动词,be动词后跟形容词, 动词后跟副词
在这里句中用的be动词“are”,所以后面跟形容词careful enough
如果要用carefully enough的话,这句话要改写成 None of the students can work carefully enough on the math problem 之类.
careful与carefully的用法
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