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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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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