题目内容

He does his homework much ________ than he did two years ago.


  1. A.
    careful
  2. B.
    more careful
  3. C.
    carefully
  4. D.
    more carefully
D
空白处处于主句的状语位置,只能修饰谓语动词does,又因为后面的从句由than引导,是比较状语从句,所以应为副词比较级。A和B分别是形容词原级、比较级,应排除。C是副词的原级,也应排除,因此,只有D才是正确答案。
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