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(2014·烟台市第二次诊断)Vitamin D helps our bodies make a special chemical，and this special chemical，________...
题目内容：
(2014·烟台市第二次诊断)Vitamin D helps our bodies make a special chemical，and this special chemical，________，affects our brains，making us feel happy.
A．in turn B．in particular
C．in advance D．in short
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