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They eat less sugar and that is ________ they have ________ white teeth.


  1. A.
    because, healthy
  2. B.
    why, health
  3. C.
    because, health
  4. D.
    why, healthy
D
解析:
考查表语从句。此题考查了两个知识点①that is why…意为“……的缘故”;
that is because…意为“那是因为……”②health是名词healthy是形容词。从题干所给的意义分析第一个空格只能用why,第二只能用作宾语的形容词healthy。所以正确答案为D。
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