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It’s necessary _____ the dog’s fur and play with it for _______.


  1. A.
    brushing, sometimes
  2. B.
    to brush, sometime
  3. C.
    brushing, sometimes
  4. D.
    to brush, some time
D
第一空只能用不定式作主语(it是形式主语);sometime:过去或未来的一个时间点,some time:一些时间,即分开是“一段”, 相连为“某时”。根据句意,第二空前有介词for,应跟一段时间some time。故选D。
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